{"id":30254,"date":"2024-11-25T08:36:31","date_gmt":"2024-11-25T00:36:31","guid":{"rendered":"https:\/\/fwq.ai\/blog\/30254\/"},"modified":"2024-11-25T08:36:31","modified_gmt":"2024-11-25T00:36:31","slug":"html5%e5%ae%9e%e7%8e%b0%e5%9b%be%e7%89%87%e5%8e%8b%e7%bc%a9%e4%b8%8a%e4%bc%a0%e5%8a%9f%e8%83%bd%e7%9a%84%e6%b7%b1%e5%ba%a6%e8%a7%a3%e6%9e%90","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/30254\/","title":{"rendered":"HTML5\u5b9e\u73b0\u56fe\u7247\u538b\u7f29\u4e0a\u4f20\u529f\u80fd\u7684\u6df1\u5ea6\u89e3\u6790"},"content":{"rendered":"<p>\u4e0b\u9762\u5c0f\u7f16\u5c31\u4e3a\u5927\u5bb6\u5e26\u6765\u4e00\u7bc7\u6df1\u5165\u7814\u7a76html5\u5b9e\u73b0\u56fe\u7247\u538b\u7f29\u4e0a\u4f20\u529f\u80fd\u3002\u5c0f\u7f16\u89c9\u5f97\u633a\u4e0d\u9519\u7684\uff0c\u73b0\u5728\u5206\u4eab\u7ed9\u5927\u5bb6\u3002\u4e5f\u7ed9\u5927\u5bb6\u4e00\u4e2a\u53c2\u8003\uff0c\u4e00\u8d77\u8ddf\u968f\u5c0f\u7f16\u8fc7\u6765\u770b\u770b\u5427<\/p>\n<p>\u4e0a\u7bc7\u6587\u7ae0\u4e2d\u63d0\u5230\u79fb\u52a8\u7aef\u4e0a\u4f20\u56fe\u7247\uff0c\u6211\u4eec\u77e5\u9053\u73b0\u5728\u6d41\u91cf\u8fd8\u662f\u633a\u8d35\u7684\uff0c\u624b\u673a\u7684\u50cf\u7d20\u662f\u8d8a\u6765\u8d8a\u9ad8\uff0c\u62cd\u4e2a\u7167\u52a8\u4e0d\u52a8\u5c31\u662f\u597d\u51e0M\uff0c\u4f24\u4e0d\u8d77\u3002\u867d\u7136\u5ba2\u6237\u7aef\u53ef\u4ee5\u8f7b\u8f7b\u677e\u677e\u5b9e\u73b0\u56fe\u7247\u538b\u7f29\u518d\u4e0a\u4f20\uff0c\u4f46\u662f\u6211\u4eec\u7684\u5e94\u7528\u8fd8\u53ef\u80fd\u5728\u6d4f\u89c8\u5668\u91cc\u9762\u6253\u5f00\uff0c\u600e\u4e48\u529e\u5462\uff0c\u56fe\u7247\u538b\u7f29\u3002\u53d7\u4ee5\u524dPC\u4e0a\u7684\u5f00\u53d1\u601d\u7ef4\u5f71\u54cd\uff0c\u5c3c\u739bjs\u54ea\u6709\u6743\u9650\u53bb\u64cd\u4f5c\u6587\u4ef6\uff0c\u54ea\u6709\u8d44\u683c\u538b\u7f29\u56fe\u7247\u554a\uff0c\u641e\u4e0d\u4e86\uff0c\u4f60\u4eec\u5ba2\u6237\u7aef\u53bb\u6574\u5427\u3002\u53ea\u80fd\u8bf4\u81ea\u5df1\u8fd8\u662f\u6709\u4e9b\u4e95\u5e95\u4e4b\u86d9\u4e86\u3002\u5728HTML5\u7684\u5f71\u54cd\u4e0b\uff0c\u524d\u7aef\u80fd\u5e72\u7684\u4e8b\u60c5\u8d8a\u6765\u8d8a\u591a\u4e86\uff0c\u5f00\u53d1\u7684\u529f\u80fd\u903c\u683c\u4e5f\u8d8a\u6765\u8d8a\u9ad8\u4e86\uff0cH5\u4e07\u5c81\uff01\u524d\u7aef\u7684\u9b45\u529b\u4e5f\u5728\u8fd9\uff0c\u8fc7\u53bb\u4e0d\u53ef\u80fd\u7684\u5e76\u4e0d\u610f\u5473\u73b0\u5728\u3001\u4ee5\u540e\u4e0d\u53ef\u80fd\uff0c\u52aa\u529b\u5427\uff0c\u9a9a\u5e74\uff01<\/p>\n<p>js\u600e\u4e48\u538b\u7f29\u56fe\u7247\uff1f\uff1f\uff1f\u6f5c\u610f\u8bc6\u91cc\u786e\u5b9e\u4e00\u5f00\u59cb\u662f\u89c9\u5f97\u5b9e\u73b0\u4e0d\u4e86\uff0c\u540e\u6765\u7ffb\u9605\u8d44\u6599\uff0c\u7814\u7a76\u4e86\u4e0b\uff0c\u53d1\u73b0\u53ef\u884c\uff01\u641e\u8d77\uff01<\/p>\n<p>\u5148\u8bf4\u8bf4H5\u4ee5\u524d\u6211\u4eec\u600e\u4e48\u4e0a\u4f20\uff0c\u4e00\u822c\u662f\u501f\u52a9\u63d2\u4ef6\u3001flash\u6216\u8005\u5e72\u8106\u4e00\u4e2a\u6587\u4ef6form\u8868\u5355\uff0c\u5c11\u64cd\u4e0d\u5c11\u5fc3\u3002<\/p>\n<p>\u81ea\u4ece\u6709\u4e86H5\uff0c\u8001\u677f\u518d\u4e5f\u4e0d\u62c5\u5fc3\u6211\u7684\u5f00\u53d1\u4e86\u3002<\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<p><span>\u70b9\u51fb\u4e0b\u8f7d<\/span>\u201c\u201d\uff1b<\/p>\n<p>\u4e0a\u7bc7\u6587\u7ae0\u63d0\u5230\u56fe\u7247\u4e0a\u4f20\u7528\u5230\u4e86FileReader\uff0cFormData\uff0c\u5b9e\u9645\u4e0a\u4e3b\u8981\u7528\u8fd9\u4e24\u4e2a\u6211\u4eec\u57fa\u672c\u80fd\u5b9e\u73b0\u56fe\u7247\u7684\u9884\u89c8\u548c\u4e0a\u4f20\u4e86\u3002<span>\u5b9e\u73b0\u56fe\u7247\u538b\u7f29\uff0c\u6211\u4eec\u9700\u8981\u501f\u52a9canvas\uff0c\u662f\u7684\uff0c\u5c31\u662fcanvas\uff01<\/span><\/p>\n<p><span>\u5927\u81f4\u601d\u8def\u662f\uff1a<\/span><\/p>\n<p><span><strong>1\u3001\u521b\u5efa\u4e00\u4e2a\u56fe\u7247\u548c\u4e00\u4e2acanvas<\/strong><\/span><\/p>\n<p><\/p>\n<p><span>XML\/HTML Code<\/span><span>\u590d\u5236\u5185\u5bb9\u5230\u526a\u8d34\u677f<\/span><\/p>\n<ol>\n<li>\n<pre>var&nbsp;image&nbsp;=&nbsp;new&nbsp;Image(),&nbsp;&nbsp;&nbsp;\r\ncanvas&nbsp;=&nbsp;document.createElement(\"canvas\"),&nbsp;&nbsp;&nbsp;\r\nctx&nbsp;=&nbsp;canvas.getContext('2d');<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/li>\n<\/ol>\n<p><strong><span>2\u3001\u6211\u4eec\u5c06input\u4e2d\u9009\u62e9\u7684\u56fe\u7247\u5730\u5740\u901a\u8fc7FileReader\u83b7\u53d6\u540e\u8d4b\u7ed9\u65b0\u5efa\u7684\u56fe\u7247\u5bf9\u8c61\uff0c\u7136\u540e\u5c06\u56fe\u7247\u5bf9\u8c61\u4e22\u5230canvas\u753b\u5e03\u4e0a\u3002<\/span><\/strong><\/p>\n<p><\/p>\n<p><span>XML\/HTML Code<\/span><span>\u590d\u5236\u5185\u5bb9\u5230\u526a\u8d34\u677f<\/span><\/p>\n<ol>\n<li>\n<pre>var&nbsp;file&nbsp;=&nbsp;obj.files[0];&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;reader&nbsp;=&nbsp;new&nbsp;FileReader();\/\/\u8bfb\u53d6\u5ba2\u6237\u7aef\u4e0a\u7684\u6587\u4ef6&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;reader.onload&nbsp;=&nbsp;function()&nbsp;{&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;url&nbsp;=&nbsp;reader.result;\/\/\u8bfb\u53d6\u5230\u7684\u6587\u4ef6\u5185\u5bb9.\u8fd9\u4e2a\u5c5e\u6027\u53ea\u5728\u8bfb\u53d6\u64cd\u4f5c\u5b8c\u6210\u4e4b\u540e\u624d\u6709\u6548,\u5e76\u4e14\u6570\u636e\u7684\u683c\u5f0f\u53d6\u51b3\u4e8e\u8bfb\u53d6\u64cd\u4f5c\u662f\u7531\u54ea\u4e2a\u65b9\u6cd5\u53d1\u8d77\u7684.\u6240\u4ee5\u5fc5\u987b\u4f7f\u7528reader.onload\uff0c&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;image.src=url;\/\/reader\u8bfb\u53d6\u7684\u6587\u4ef6\u5185\u5bb9\u662fbase64,\u5229\u7528\u8fd9\u4e2aurl\u5c31\u80fd\u5b9e\u73b0\u4e0a\u4f20\u524d\u9884\u89c8\u56fe\u7247&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;...&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;};&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;image.onload&nbsp;=&nbsp;function()&nbsp;{&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;w&nbsp;=&nbsp;image.naturalWidth,&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;h&nbsp;=&nbsp;image.naturalHeight;&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;canvas.width&nbsp;=&nbsp;w;&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;canvas.height&nbsp;=&nbsp;h;&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ctx.drawImage(image,&nbsp;0,&nbsp;0,&nbsp;w,&nbsp;h,&nbsp;0,&nbsp;0,&nbsp;w,&nbsp;h);&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;fileUpload();&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;};&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;reader.readAsDataURL(file);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/li>\n<\/ol>\n<p>\u8fd9\u91cc\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0ccanvas\u5c06\u56fe\u7247\u753b\u5230\u753b\u5e03\u4e0a\u7684\u65f6\u5019\u9700\u8981\u786e\u5b9acanvas\u7684\u5c3a\u5bf8\uff0c\u540c\u65f6\u8bbe\u5b9a\u597ddrawImage\u7684\u53c2\u6570\uff0c\u5177\u4f53\u5982\u4e0b\uff1a<\/p>\n<p><\/p>\n<p><span>XML\/HTML Code<\/span><span>\u590d\u5236\u5185\u5bb9\u5230\u526a\u8d34\u677f<\/span><\/p>\n<ol>\n<li>\n<p>void&nbsp;ctx.drawImage(image,&nbsp;sx,&nbsp;sy,&nbsp;sWidth,&nbsp;sHeight,&nbsp;dx,&nbsp;dy,&nbsp;dWidth,&nbsp;dHeight);&nbsp;&nbsp;<\/p>\n<\/li>\n<\/ol>\n<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/000\/000\/007\/17b6c3ea02bba835ac66ecb89575b56d-0.jpg\" class=\"aligncenter\" title=\"HTML5\u5b9e\u73b0\u56fe\u7247\u538b\u7f29\u4e0a\u4f20\u529f\u80fd\u7684\u6df1\u5ea6\u89e3\u6790\u63d2\u56fe\" alt=\"HTML5\u5b9e\u73b0\u56fe\u7247\u538b\u7f29\u4e0a\u4f20\u529f\u80fd\u7684\u6df1\u5ea6\u89e3\u6790\u63d2\u56fe\" \/><\/p>\n<p><strong><span style=\"font-family:NSimsun\">dx<\/span><\/strong>\u6e90\u56fe\u50cf\u7684\u5de6\u4e0a\u89d2\u5728\u76ee\u6807canvas\u4e0a&nbsp;X \u8f74\u7684\u4f4d\u7f6e\u3002<\/p>\n<p><strong><span style=\"font-family:NSimsun\">dy<\/span><\/strong>\u6e90\u56fe\u50cf\u7684\u5de6\u4e0a\u89d2\u5728\u76ee\u6807canvas\u4e0a&nbsp;Y \u8f74\u7684\u4f4d\u7f6e\u3002<\/p>\n<p><strong><span style=\"font-family:NSimsun\">dWidth<\/span><\/strong>\u5728\u76ee\u6807canvas\u4e0a\u7ed8\u5236\u56fe\u50cf\u7684\u5bbd\u5ea6\u3002 \u5141\u8bb8\u5bf9\u7ed8\u5236\u7684\u56fe\u50cf\u8fdb\u884c\u7f29\u653e\u3002 \u5982\u679c\u4e0d\u8bf4\u660e\uff0c \u5728\u7ed8\u5236\u65f6\u56fe\u7247\u5bbd\u5ea6\u4e0d\u4f1a\u7f29\u653e\u3002<\/p>\n<p><strong><span style=\"font-family:NSimsun\">dHeight<\/span><\/strong>\u5728\u76ee\u6807canvas\u4e0a\u7ed8\u5236\u56fe\u50cf\u7684\u9ad8\u5ea6\u3002&nbsp;\u5141\u8bb8\u5bf9\u7ed8\u5236\u7684\u56fe\u50cf\u8fdb\u884c\u7f29\u653e\u3002 \u5982\u679c\u4e0d\u8bf4\u660e\uff0c \u5728\u7ed8\u5236\u65f6\u56fe\u7247\u9ad8\u5ea6\u4e0d\u4f1a\u7f29\u653e\u3002<\/p>\n<p><strong><span style=\"font-family:NSimsun\">sx<\/span><\/strong>\u9700\u8981\u7ed8\u5236\u5230\u76ee\u6807\u4e0a\u4e0b\u6587\u4e2d\u7684\uff0c\u6e90\u56fe\u50cf\u7684\u77e9\u5f62\u9009\u62e9\u6846\u7684\u5de6\u4e0a\u89d2 X \u5750\u6807\u3002<\/p>\n<p><strong><span style=\"font-family:NSimsun\">sy<\/span><\/strong>\u9700\u8981\u7ed8\u5236\u5230\u76ee\u6807\u4e0a\u4e0b\u6587\u4e2d\u7684\uff0c\u6e90\u56fe\u50cf\u7684\u77e9\u5f62\u9009\u62e9\u6846\u7684\u5de6\u4e0a\u89d2 Y \u5750\u6807\u3002<\/p>\n<p><strong><span style=\"font-family:NSimsun\">sWidth<\/span><\/strong>\u9700\u8981\u7ed8\u5236\u5230\u76ee\u6807\u4e0a\u4e0b\u6587\u4e2d\u7684\uff0c\u6e90\u56fe\u50cf\u7684\u77e9\u5f62\u9009\u62e9\u6846\u7684\u5bbd\u5ea6\u3002\u5982\u679c\u4e0d\u8bf4\u660e\uff0c\u6574\u4e2a\u77e9\u5f62\u4ece\u5750\u6807\u7684sx\u548csy\u5f00\u59cb\uff0c\u5230\u56fe\u50cf\u7684\u53f3\u4e0b\u89d2\u7ed3\u675f\u3002<\/p>\n<p><strong><span style=\"font-family:NSimsun\">sHeight<\/span><\/strong>\u9700\u8981\u7ed8\u5236\u5230\u76ee\u6807\u4e0a\u4e0b\u6587\u4e2d\u7684\uff0c\u6e90\u56fe\u50cf\u7684\u77e9\u5f62\u9009\u62e9\u6846\u7684\u9ad8\u5ea6\u3002<\/p>\n<p><strong>\u4e3a\u4e86\u4e0a\u4f20\u5b8c\u6574\u7684\u56fe\u7247\uff0c\u8fd9\u91ccdx,dy\u5fc5\u987b\u8bbe\u7f6e\u4e3a0\uff0cdWidth\u548cdHeight\u5fc5\u987b\u8bbe\u7f6e\u4e3a\u539f\u59cb\u56fe\u7247\u7684\u5bbd\u5ea6\u548c\u9ad8\u5ea6\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u6211\u4eec\u9700\u8981\u7b49image\u5bf9\u8c61\u4e0b\u8f7d\u5b8c\u6bd5\u540e\u83b7\u53d6\u5176\u539f\u59cb\u5c3a\u5bf8\uff0c\u8fd9\u5f88\u5173\u952e\uff01<\/strong><\/p>\n<p><strong><span>3\u3001\u56fe\u7247\u4e0a\u4f20<\/span><\/strong><\/p>\n<p><\/p>\n<p><span>XML\/HTML Code<\/span><span>\u590d\u5236\u5185\u5bb9\u5230\u526a\u8d34\u677f<\/span><\/p>\n<ol>\n<li>\n<pre>function&nbsp;fileUpload()&nbsp;{&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;data&nbsp;=&nbsp;canvas.toDataURL(\"image\/jpeg\",&nbsp;quality);&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\/\/dataURL&nbsp;\u7684\u683c\u5f0f\u4e3a&nbsp;\u201cdata:image\/png;base64,****\u201d,\u9017\u53f7\u4e4b\u524d\u90fd\u662f\u4e00\u4e9b\u8bf4\u660e\u6027\u7684\u6587\u5b57\uff0c\u6211\u4eec\u53ea\u9700\u8981\u9017\u53f7\u4e4b\u540e\u7684\u5c31\u884c\u4e86&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;datadata&nbsp;=&nbsp;data.split(',')[1];&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;data&nbsp;=&nbsp;window.atob(data);&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;ia&nbsp;=&nbsp;new&nbsp;Uint8Array(data.length);&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;for&nbsp;(var&nbsp;i&nbsp;=&nbsp;0;&nbsp;i&nbsp;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/li>\n<\/ol>\n<p>\u8fd9\u91cc\u7528\u7684\u5173\u952e\u65b9\u6cd5\u662fcanvas.toDataURL<\/p>\n<p><\/p>\n<p><span>XML\/HTML Code<\/span><span>\u590d\u5236\u5185\u5bb9\u5230\u526a\u8d34\u677f<\/span><\/p>\n<ol>\n<li>\n<p>canvas.toDataURL(type,&nbsp;encoderOptions);&nbsp;&nbsp;<\/p>\n<\/li>\n<\/ol>\n<p>\u5b98\u65b9\u7684\u8bf4\u660e\u662fThe&nbsp;<strong><span style=\"font-family:NSimsun\">HTMLCanvasElement.toDataURL()<\/span><\/strong>&nbsp;method returns a&nbsp;data URI&nbsp;containing a representation of the image in the format specified by the&nbsp;<span style=\"font-family:NSimsun\">type<\/span>&nbsp;parameter (defaults to&nbsp;PNG). The returned image is in a resolution of 96 dpi.\u5b9e\u9645\u4e0a\u5c31\u662f\u8bfb\u53d6canvas\u753b\u5e03\u4e0a\u56fe\u7247\u7684\u6570\u636e\u3002\u5176\u9ed8\u8ba4\u662fpng\u683c\u5f0f\uff0c\u5982\u679c\u7b2c\u4e00\u4e2a\u53c2\u6570type\u662fimage\/jpeg\u7684\u8bdd\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570encoderOptions\u5c31\u53ef\u4ee5\u7528\u6765\u8bbe\u7f6e\u56fe\u7247\u7684\u538b\u7f29\u8d28\u91cf\uff0c\u7ecf\u8fc7\u6d4b\u8bd5\uff0c\u5982\u679c\u662fpng\u683c\u5f0f\uff0c100%\u7684\u5bbd\u9ad8\u7ecf\u8fc7\u8be5\u65b9\u6cd5\u8fd8\u6709\u53ef\u80fd\u4f7f\u56fe\u7247\u53d8\u5927~~~~\u9002\u5f97\u5176\u53cd\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u5728canvas.drawImage\u7684\u65f6\u5019\u9002\u5f53\u8bbe\u7f6esWidth\u548csHeight\uff0c\u6bd4\u5982\u540c\u6bd4\u4f8b\u7f29\u5c0f1.5\u500d\u7b49\uff0c\u56fe\u7247\u8d28\u91cf\u5176\u5b9e\u5e76\u4e0d\u592a\u5f71\u54cd\u67e5\u770b\uff0c\u5c24\u5176\u5bf9\u5c3a\u5bf8\u6bd4\u8f83\u5927\u7684\u56fe\u7247\u6765\u8bf4\u3002<\/p>\n<p>\u4e0a\u9762\u8fd8\u6709\u6bd4\u8f83\u964c\u751f\u7684\u65b9\u6cd5<strong>atob<\/strong>\uff0c\u5176\u4f5c\u7528\u662f\u505a\u89e3\u7801\uff0c\u56e0\u4e3a\u56fe\u7247\u683c\u5f0f\u7684base64.<\/p>\n<p><\/p>\n<p><span>XML\/HTML Code<\/span><span>\u590d\u5236\u5185\u5bb9\u5230\u526a\u8d34\u677f<\/span><\/p>\n<ol>\n<li>\n<p>var&nbsp;<span>encodedData<\/span>&nbsp;=&nbsp;<span>window<\/span>.btoa(&#8220;Hello,&nbsp;world&#8221;);&nbsp;\/\/&nbsp;encode&nbsp;a&nbsp;string &nbsp;&nbsp;<\/p>\n<\/li>\n<li>\n<p>var&nbsp;<span>decodedData<\/span>&nbsp;=&nbsp;<span>window<\/span>.atob(encodedData);&nbsp;\/\/&nbsp;decode&nbsp;the&nbsp;string&nbsp;&nbsp;<\/p>\n<\/li>\n<\/ol>\n<p>\u8be5\u65b9\u6cd5\u89e3\u7801\u51fa\u6765\u53ef\u80fd\u662f\u4e00\u5806\u4e71\u7801\uff0c<strong>Uint8Array<\/strong>\u8fd4\u56de\u7684\u662f8\u8fdb\u5236\u6574\u578b\u6570\u7ec4\u3002<\/p>\n<p><strong>Blob\u662f\u5b58\u50a8\u4e8c\u8fdb\u5236\u6587\u4ef6\u7684\u5bb9\u5668<\/strong>\uff0c\u5178\u578b\u7684Blob\u5bf9\u8c61\u662f\u4e00\u4e2a\u56fe\u7247\u6216\u8005\u58f0\u97f3\u6587\u4ef6\uff0c\u5176\u9ed8\u8ba4\u662fPNG\u683c\u5f0f\u3002<\/p>\n<p><\/p>\n<p><span>XML\/HTML Code<\/span><span>\u590d\u5236\u5185\u5bb9\u5230\u526a\u8d34\u677f<\/span><\/p>\n<ol>\n<li>\n<p>var&nbsp;<span>blob<\/span>&nbsp;=&nbsp;<span>new<\/span>&nbsp;Blob([ia],&nbsp;{ &nbsp;&nbsp;<\/p>\n<\/li>\n<li>\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;type:&nbsp;&#8220;image\/jpeg&#8221; &nbsp;&nbsp;<\/p>\n<\/li>\n<li>\n<p>&nbsp;&nbsp;&nbsp;&nbsp;});&nbsp;&nbsp;<\/p>\n<\/li>\n<\/ol>\n<p>\u6700\u540e\u901a\u8fc7ajax\u5c06Blob\u5bf9\u8c61\u53d1\u9001\u5230server\u5373\u53ef\u3002<\/p>\n<p>\u6574\u4e2a\u6d41\u7a0b\u5927\u81f4\u5982\u4e0a\uff0c\u4f46\u662f~~~\u5b9e\u73b0\u4ee5\u540e\u6d4b\u8bd5\u8dd1\u6765\u8bf4\uff1a\u201c\u4f60\u4e0d\u662f\u8bf4\u56fe\u7247\u538b\u7f29\u4e86\u5417\uff0c\u4e3a\u4ec0\u4e48\u56fe\u7247\u8fd8\u662f\u4e0a\u4f20\u90a3\u4e48\u6162\uff01\u201d\uff0c\u54e5\u62ff\u8d77\u624b\u673a\u5bf9\u59b9\u7eb8\u6f14\u793a\u4e86\u4e00\u4e0b\uff0c\u660e\u660e\u5f88\u5feb\u561b\uff0c\u4e8e\u662f\u53cd\u9053\u201c\u662f\u4f60\u624b\u673a\u4e0d\u884c\u6216\u8005\u7f51\u7edc\u4e0d\u597d\u5427\uff0c\u4f60\u4e0b\u8f7d\u56fe\u7247\u770b\u660e\u660e\u53d8\u5c0f\u4e86\uff0c\u6bd4\u4e4b\u524d\u80af\u5b9a\u5feb\uff0c\u4f60\u770b\u6211\u79d2\u4f20\u201d\u3002\u5475\u5475\uff0c\u8bf4\u5f52\u8bf4\uff0c\u8fd8\u662f\u5077\u5077\u68c0\u67e5\u4ee3\u7801\uff0c\u5728\u6d4f\u89c8\u5668\u4e2d\u6253\u65f6\u95f4log\uff0c\u5bf9\u6bd4\u6ca1\u538b\u7f29\u4e4b\u524d\u7684\uff0c\u5c3c\u739b\uff01\uff01\uff01\u5c45\u7136\u624d\u5feb\u4e86\u51e0\u767e\u6beb\u79d2\uff01\uff01\u6298\u817e\u4e86\u534a\u5929\uff0c\u4e4b\u524d\u7684\u4ee3\u7801\u4e5f\u91cd\u6784\u4e86\uff0c\u73a9\u6211\u5462\u3002<\/p>\n<p>\u7ec6\u5fc3\u7684\u5927\u795e\u770b\u4e86\u4e0a\u9762\u7684\u4ee3\u7801\u4f30\u8ba1\u80fd\u731c\u51fa\u95ee\u9898\u5728\u54ea\uff0c\u6ca1\u9519\uff0c<strong>\u83b7\u53d6\u672c\u5730\u56fe\u7247\u957f\u5bbd\u5c3a\u5bf8\u7684\u65f6\u5019\u51fa\u4e86\u95ee\u9898\u3002<\/strong><\/p>\n<p style=\"text-align:center\"><strong><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/000\/000\/007\/17b6c3ea02bba835ac66ecb89575b56d-1.png\" class=\"aligncenter\" title=\"HTML5\u5b9e\u73b0\u56fe\u7247\u538b\u7f29\u4e0a\u4f20\u529f\u80fd\u7684\u6df1\u5ea6\u89e3\u6790\u63d2\u56fe1\" alt=\"HTML5\u5b9e\u73b0\u56fe\u7247\u538b\u7f29\u4e0a\u4f20\u529f\u80fd\u7684\u6df1\u5ea6\u89e3\u6790\u63d2\u56fe1\" \/><\/strong><\/p>\n<p>\u6211\u53bb\uff0c\u83b7\u53d6\u672c\u57304M\u5927\u5c0f\u7684\u56fe\u7247\u5c3a\u5bf8\u82b1\u4e863174ms\uff01\uff01\uff0c\u56fe\u7247\u8d8a\u5927\u65f6\u95f4\u4e5f\u8d8a\u4e45~<\/p>\n<p><\/p>\n<p><span>JavaScript Code<\/span><span>\u590d\u5236\u5185\u5bb9\u5230\u526a\u8d34\u677f<\/span><\/p>\n<ol>\n<li>\n<pre>image.onload&nbsp;=&nbsp;function()&nbsp;{&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;w&nbsp;=&nbsp;image.naturalWidth,&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;h&nbsp;=&nbsp;image.naturalHeight;&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;canvas.width&nbsp;=&nbsp;w&nbsp;\/&nbsp;1.5;&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;canvas.height&nbsp;=&nbsp;h&nbsp;\/&nbsp;1.5;&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ctx.drawImage(image,&nbsp;0,&nbsp;0,&nbsp;w,&nbsp;h,&nbsp;0,&nbsp;0,&nbsp;w&nbsp;\/&nbsp;1.5,&nbsp;h&nbsp;\/&nbsp;1.5);&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Upload.fileUpload(type);&nbsp;&nbsp;&nbsp;\r\n};<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/li>\n<\/ol>\n<p>\u6d4f\u89c8\u5668\u5728\u672c\u5730\u53d6\u56fe\u7247\u7684\u65f6\u5019\u662f\u6ca1\u6cd5\u76f4\u63a5\u50cffile.size\u4e00\u6837\u83b7\u53d6\u5176\u957f\u5bbd\u7684\uff0c\u53ea\u80fd\u901a\u8fc7FileReader\u62ff\u5230\u5185\u5bb9\u540e\u8d4b\u503c\u7ed9\u65b0\u5efa\u7684image\u5bf9\u8c61\uff0c\u65b0\u5efa\u7684image\u5bf9\u8c61\u4e0b\u8f7d\u9700\u8981\u65f6\u95f4\uff01\u600e\u4e48\u7834\uff1f\u4e0d\u5c31\u662f\u83b7\u53d6\u672c\u5730\u56fe\u7247\u7684\u5c3a\u5bf8\u5417\uff0c\u96be\u9053\u6ca1\u6709\u522b\u7684\u529e\u6cd5\u4e86\uff1f<\/p>\n<p>\u4e8e\u662f\u60f3\u5230\u4e86\u4e4b\u524d\u7814\u7a76\u8fc7\u7684\u5feb\u901f\u83b7\u53d6\u56fe\u7247\u957f\u5bbd\u7684\u535a\u6587\uff0c<strong><span>\u70b9\u51fb\u8fdb\u5165<\/span><\/strong> \uff0cdemo\u5730\u5740\uff1ahttp:\/\/jsbin.com\/jivugadure\/edit?html,js,output\uff0c\u5b9a\u65f6\u53bb\u67e5\u8be2\u56fe\u7247\u52a0\u8f7d\u8fc7\u7a0b\u4e2d\u7684\u9ad8\u5ea6\u6216\u8005\u5bbd\u5ea6\uff0c\u4e0d\u7528\u7b49\u6574\u4e2a\u56fe\u7247\u52a0\u8f7d\u5b8c\u6bd5\u3002<\/p>\n<p>\u6d4b\u4e86\u4e0b\uff0c\u8fd8\u662f\u4e0d\u884c\uff0c\u56e0\u4e3a\u5b9a\u65f6\u67e5\u8be2\u8fd9\u79cd\u65b9\u6cd5\u5bf9\u5e38\u89c4\u7684server\u8fd4\u56de\u7684\u56fe\u7247\u6709\u4f5c\u7528\uff0c\u8fd9\u91cc\u56fe\u7247\u5730\u5740\u662fbase64\uff0c\u8c8c\u4f3c\u65f6\u95f4\u8fd8\u66f4\u4e45\u4e86~\u54ed\u3002<\/p>\n<p><strong><span style=\"color:#ff0000\">\u5c0f\u7ed3\u4e00\u4e0b\uff1a<\/span><\/strong><\/p>\n<p>1\u3001\u7528HTML5\u6765\u538b\u7f29\u56fe\u7247\u4e0a\u4f20\u662f\u53ef\u884c\u7684\uff0c\u5728\u79fb\u52a8\u7aef\u6211\u4eec\u4e0d\u7528\u4f9d\u8d56\u5ba2\u6237\u7aef\u6216\u8005\u63d2\u4ef6\uff0c\u76ee\u524d\u4e3b\u6d41\u6d4f\u89c8\u5668\u652f\u6301\u7a0b\u5ea6\u5df2\u7ecf\u5f88\u9ad8\u4e86\u3002<\/p>\n<p>2\u3001\u538b\u7f29\u56fe\u7247\u4e00\u65b9\u9762\u662f\u60f3\u51cf\u5c11\u7528\u6237\u4e0a\u4f20\u7b49\u5f85\u7684\u65f6\u95f4\uff0c\u53e6\u5916\u4e5f\u51cf\u5c11\u7528\u6237\u4e3a\u6b64\u727a\u7272\u7684\u6d41\u91cf\uff0c\u4ece\u6574\u4f53\u65f6\u95f4\u6765\u770b\uff0c\u56e0\u4e3a\u83b7\u53d6\u56fe\u7247\u5c3a\u5bf8\u5bfc\u81f4\u591a\u4e00\u6b21\u4e0b\u8f7d\u9700\u8981\u8017\u65f6\uff0c\u5176\u5b9e\u538b\u4e0d\u538b\u7f29\u65f6\u95f4\u5dee\u522b\u5e76\u4e0d\u662f\u7279\u522b\u5927\u3002\u9664\u975e\u5927\u795e\u4eec\u627e\u5230\u5408\u9002\u7684\u65b9\u6cd5\u80fd\u591f\u76f4\u63a5\u83b7\u53d6\u56fe\u7247\u7684\u5c3a\u5bf8\uff0c\u9ebb\u70e6\u4e5f\u544a\u77e5\u6211\u4e00\u58f0\uff0c\u4e07\u5206\u611f\u8c22\uff1b<\/p>\n<p>3\u3001\u65e2\u7136\u65f6\u95f4\u6210\u672c\u5dee\u4e0d\u591a\uff0c\u4f46\u662f\u6211\u4eec\u538b\u7f29\u4e86\u56fe\u7247\uff0c\u51cf\u5c11\u4e86\u56fe\u7247\u7684\u5927\u5c0f\uff0c\u51cf\u5c11\u4e86\u6d41\u91cf\u7684\u6d88\u8017\uff0c\u5b58\u50a8\u7a7a\u95f4\u4ee5\u53ca\u4e0b\u6b21\u83b7\u53d6\u8be5\u56fe\u7247\u7684\u65f6\u95f4\uff0c\u6240\u4ee5\u8fd8\u662f\u503c\u5f97\u7684\u3002<\/p>\n<p>&nbsp;<strong><span>\u8865\u5145\u6e90\u4ee3\u7801\uff1a<\/span><\/strong><\/p>\n<p><\/p>\n<p><span>JavaScript Code<\/span><span>\u590d\u5236\u5185\u5bb9\u5230\u526a\u8d34\u677f<\/span><\/p>\n<ol>\n<li>\n<pre>(function($)&nbsp;{&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;$.extend($.fn,&nbsp;{&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;fileUpload:&nbsp;function(opts)&nbsp;{&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.each(function()&nbsp;{&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;$self&nbsp;=&nbsp;$(this);&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;quality&nbsp;=&nbsp;opts.quality&nbsp;?&nbsp;opts.quality&nbsp;\/&nbsp;100&nbsp;:&nbsp;0.2;&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;dom&nbsp;=&nbsp;{&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\"fileToUpload\":&nbsp;$self.find(\".fileToUpload\"),&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\"thumb\":&nbsp;$self.find(\".thumb\"),&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\"progress\":&nbsp;$self.find(\".upload-progress\")&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;};&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;image&nbsp;=&nbsp;new&nbsp;Image(),&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;canvas&nbsp;=&nbsp;document.createElement(\"canvas\"),&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ctx&nbsp;=&nbsp;canvas.getContext('2d');&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;funs&nbsp;=&nbsp;{&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;setImageUrl:&nbsp;function(url)&nbsp;{&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;image.src&nbsp;=&nbsp;url;&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;},&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;bindEvent:&nbsp;function()&nbsp;{&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;console.log(dom.fileToUpload)&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;dom.fileToUpload.on(\"change\",&nbsp;function()&nbsp;{&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;funs.fileSelect(this);&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;});&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;},&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;fileSelect:&nbsp;function(obj)&nbsp;{&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;file&nbsp;=&nbsp;obj.files[0];&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;reader&nbsp;=&nbsp;new&nbsp;FileReader();&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;reader.onload&nbsp;=&nbsp;function()&nbsp;{&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;url&nbsp;=&nbsp;reader.result;&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;funs.setImageUrl(url);&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;dom.thumb.html(image);&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;};&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;image.onload&nbsp;=&nbsp;function()&nbsp;{&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;w&nbsp;=&nbsp;image.naturalWidth,&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;h&nbsp;=&nbsp;image.naturalHeight;&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;canvas.width&nbsp;=&nbsp;w;&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;canvas.height&nbsp;=&nbsp;h;&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ctx.drawImage(image,&nbsp;0,&nbsp;0,&nbsp;w,&nbsp;h,&nbsp;0,&nbsp;0,&nbsp;w,&nbsp;h);&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;funs.fileUpload();&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;};&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;reader.readAsDataURL(file);&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;},&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;fileUpload:&nbsp;function()&nbsp;{&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;data&nbsp;=&nbsp;canvas.toDataURL(\"image\/jpeg\",&nbsp;quality);&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\/\/dataURL&nbsp;\u7684\u683c\u5f0f\u4e3a&nbsp;\u201cdata:image\/png;base64,****\u201d,\u9017\u53f7\u4e4b\u524d\u90fd\u662f\u4e00\u4e9b\u8bf4\u660e\u6027\u7684\u6587\u5b57\uff0c\u6211\u4eec\u53ea\u9700\u8981\u9017\u53f7\u4e4b\u540e\u7684\u5c31\u884c\u4e86&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;data&nbsp;=&nbsp;data.split(',')[1];&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;data&nbsp;=&nbsp;window.atob(data);&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;ia&nbsp;=&nbsp;new&nbsp;Uint8Array(data.length);&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;for&nbsp;(var&nbsp;i&nbsp;=&nbsp;0;&nbsp;i&nbsp;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/li>\n<\/ol>\n<p>\u8c03\u7528\u65b9\u5f0f\uff1a<\/p>\n<p><\/p>\n<p><span>JavaScript Code<\/span><span>\u590d\u5236\u5185\u5bb9\u5230\u526a\u8d34\u677f<\/span><\/p>\n<ol>\n<li>\n<pre>$(\".fileUpload\").fileUpload({&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\"url\":&nbsp;\"savetofile.php\",&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\"file\":&nbsp;\"myFile\",&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\"success\":function(evt){&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;console.log(evt.target.responseText)&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}&nbsp;&nbsp;&nbsp;\r\n});<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/li>\n<\/ol>\n<p>\u5e0c\u671b\u5927\u5bb6\u80fd\u627e\u5230\u66f4\u597d\u7684\u529e\u6cd5\uff0c\u591a\u591a\u4ea4\u6d41\uff01\u611f\u8c22\uff01<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fHTML5\u5b9e\u73b0\u56fe\u7247\u538b\u7f29\u4e0a\u4f20\u529f\u80fd\u7684\u6df1\u5ea6\u89e3\u6790\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e0b\u9762\u5c0f\u7f16\u5c31\u4e3a\u5927\u5bb6\u5e26\u6765\u4e00\u7bc7\u6df1\u5165\u7814\u7a76html5\u5b9e\u73b0\u56fe\u7247\u538b\u7f29\u4e0a\u4f20\u529f\u80fd\u3002\u5c0f\u7f16\u89c9\u5f97\u633a\u4e0d\u9519\u7684\uff0c\u73b0\u5728\u5206\u4eab\u7ed9\u5927\u5bb6\u3002\u4e5f\u7ed9\u5927\u5bb6\u4e00\u4e2a\u53c2\u8003\uff0c\u4e00\u8d77\u8ddf\u968f\u5c0f\u7f16\u8fc7\u6765\u770b\u770b\u5427 \u4e0a\u7bc7\u6587\u7ae0\u4e2d\u63d0\u5230\u79fb\u52a8\u7aef\u4e0a\u4f20\u56fe\u7247\uff0c\u6211\u4eec\u77e5\u9053\u73b0\u5728\u6d41\u91cf\u8fd8\u662f\u633a\u8d35\u7684\uff0c\u624b\u673a\u7684\u50cf\u7d20\u662f\u8d8a\u6765\u8d8a\u9ad8\uff0c\u62cd\u4e2a\u7167\u52a8\u4e0d\u52a8\u5c31\u662f\u597d\u51e0M\uff0c\u4f24\u4e0d\u8d77\u3002\u867d\u7136\u5ba2\u6237\u7aef\u53ef\u4ee5\u8f7b\u8f7b\u677e\u677e\u5b9e\u73b0\u56fe\u7247\u538b\u7f29\u518d\u4e0a\u4f20\uff0c\u4f46\u662f\u6211\u4eec\u7684\u5e94\u7528\u8fd8\u53ef\u80fd\u5728\u6d4f\u89c8\u5668\u91cc\u9762\u6253\u5f00\uff0c\u600e\u4e48\u529e\u5462\uff0c\u56fe\u7247\u538b\u7f29\u3002\u53d7\u4ee5\u524dPC\u4e0a\u7684\u5f00\u53d1\u601d\u7ef4\u5f71\u54cd\uff0c\u5c3c\u739bjs\u54ea\u6709\u6743\u9650\u53bb\u64cd\u4f5c\u6587\u4ef6\uff0c\u54ea\u6709\u8d44\u683c\u538b\u7f29\u56fe\u7247\u554a\uff0c\u641e\u4e0d\u4e86\uff0c\u4f60\u4eec\u5ba2\u6237\u7aef\u53bb\u6574\u5427\u3002\u53ea\u80fd\u8bf4\u81ea\u5df1\u8fd8\u662f\u6709\u4e9b\u4e95\u5e95\u4e4b\u86d9\u4e86\u3002\u5728HTML5\u7684\u5f71\u54cd\u4e0b\uff0c\u524d\u7aef\u80fd\u5e72\u7684\u4e8b\u60c5\u8d8a\u6765\u8d8a\u591a\u4e86\uff0c\u5f00\u53d1\u7684\u529f\u80fd\u903c\u683c\u4e5f\u8d8a\u6765\u8d8a\u9ad8\u4e86\uff0cH5\u4e07\u5c81\uff01\u524d\u7aef\u7684\u9b45\u529b\u4e5f\u5728\u8fd9\uff0c\u8fc7\u53bb\u4e0d\u53ef\u80fd\u7684\u5e76\u4e0d\u610f\u5473\u73b0\u5728\u3001\u4ee5\u540e\u4e0d\u53ef\u80fd\uff0c\u52aa\u529b\u5427\uff0c\u9a9a\u5e74\uff01 js\u600e\u4e48\u538b\u7f29\u56fe\u7247\uff1f\uff1f\uff1f\u6f5c\u610f\u8bc6\u91cc\u786e\u5b9e\u4e00\u5f00\u59cb\u662f\u89c9\u5f97\u5b9e\u73b0\u4e0d\u4e86\uff0c\u540e\u6765\u7ffb\u9605\u8d44\u6599\uff0c\u7814\u7a76\u4e86\u4e0b\uff0c\u53d1\u73b0\u53ef\u884c\uff01\u641e\u8d77\uff01 \u5148\u8bf4\u8bf4H5\u4ee5\u524d\u6211\u4eec\u600e\u4e48\u4e0a\u4f20\uff0c\u4e00\u822c\u662f\u501f\u52a9\u63d2\u4ef6\u3001flash\u6216\u8005\u5e72\u8106\u4e00\u4e2a\u6587\u4ef6form\u8868\u5355\uff0c\u5c11\u64cd\u4e0d\u5c11\u5fc3\u3002 \u81ea\u4ece\u6709\u4e86H5\uff0c\u8001\u677f\u518d\u4e5f\u4e0d\u62c5\u5fc3\u6211\u7684\u5f00\u53d1\u4e86\u3002 \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b \u70b9\u51fb\u4e0b\u8f7d\u201c\u201d\uff1b \u4e0a\u7bc7\u6587\u7ae0\u63d0\u5230\u56fe\u7247\u4e0a\u4f20\u7528\u5230\u4e86FileReader\uff0cFormData\uff0c\u5b9e\u9645\u4e0a\u4e3b\u8981\u7528\u8fd9\u4e24\u4e2a\u6211\u4eec\u57fa\u672c\u80fd\u5b9e\u73b0\u56fe\u7247\u7684\u9884\u89c8\u548c\u4e0a\u4f20\u4e86\u3002\u5b9e\u73b0\u56fe\u7247\u538b\u7f29\uff0c\u6211\u4eec\u9700\u8981\u501f\u52a9canvas\uff0c\u662f\u7684\uff0c\u5c31\u662fcanvas\uff01 \u5927\u81f4\u601d\u8def\u662f\uff1a 1\u3001\u521b\u5efa\u4e00\u4e2a\u56fe\u7247\u548c\u4e00\u4e2acanvas XML\/HTML Code\u590d\u5236\u5185\u5bb9\u5230\u526a\u8d34\u677f var&nbsp;image&nbsp;=&nbsp;new&nbsp;Image(),&nbsp;&nbsp;&nbsp; canvas&nbsp;=&nbsp;document.createElement(&#8220;canvas&#8221;),&nbsp;&nbsp;&nbsp; ctx&nbsp;=&nbsp;canvas.getContext(&#8216;2d&#8217;); \u767b\u5f55\u540e\u590d\u5236 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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#8230;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;};&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;image.onload&nbsp;=&nbsp;function()&nbsp;{&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;w&nbsp;=&nbsp;image.naturalWidth,&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;h&nbsp;=&nbsp;image.naturalHeight;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;canvas.width&nbsp;=&nbsp;w;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;canvas.height&nbsp;=&nbsp;h;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ctx.drawImage(image,&nbsp;0,&nbsp;0,&nbsp;w,&nbsp;h,&nbsp;0,&nbsp;0,&nbsp;w,&nbsp;h);&nbsp;&nbsp;&nbsp; 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