{"id":3364,"date":"2024-11-10T17:10:14","date_gmt":"2024-11-10T09:10:14","guid":{"rendered":"https:\/\/fwq.ai\/blog\/3364\/"},"modified":"2024-11-10T17:10:14","modified_gmt":"2024-11-10T09:10:14","slug":"js%e5%a6%82%e4%bd%95%e5%ad%98%e5%82%a8%e8%b6%85%e9%95%bf%e5%ad%97%e7%ac%a6%e4%b8%b2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/3364\/","title":{"rendered":"js\u5982\u4f55\u5b58\u50a8\u8d85\u957f\u5b57\u7b26\u4e32"},"content":{"rendered":"<blockquote><p>\n  \u4f7f\u7528 javascript \u5b58\u50a8\u8d85\u957f\u5b57\u7b26\u4e32\u6838\u5fc3\u7b54\u6848\uff1a\u4f7f\u7528 javascript \u5b58\u50a8\u8d85\u957f\u5b57\u7b26\u4e32\u6709\u4e24\u79cd\u5e38\u7528\u65b9\u6cd5\uff1a\u5206\u5272\u5b57\u7b26\u4e32\u548c\u4f7f\u7528 blob \u5bf9\u8c61\u3002\u8be6\u7ec6\u63cf\u8ff0\uff1a\u5206\u5272\u5b57\u7b26\u4e32\u5c06\u8d85\u957f\u5b57\u7b26\u4e32\u5206\u5272\u6210\u8f83\u5c0f\u7684\u5757\u3002\u5c06\u6bcf\u4e2a\u5757\u5b58\u50a8\u5728\u5355\u72ec\u7684\u53d8\u91cf\u4e2d\u3002\u4f7f\u7528 blob \u5bf9\u8c61\u521b\u5efa\u4e00\u4e2a blob \u5bf9\u8c61\uff0c\u5176\u4e2d\u5305\u542b\u8d85\u957f\u5b57\u7b26\u4e32\u3002\u5c06 blob \u5bf9\u8c61\u5b58\u50a8\u5728\u53d8\u91cf\u4e2d\u3002\u4f7f\u7528 filereader \u8bfb\u53d6 blob \u5bf9\u8c61\u4e2d\u7684\u5185\u5bb9\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/08\/2024110810455133516.jpg\" class=\"aligncenter\" title=\"js\u5982\u4f55\u5b58\u50a8\u8d85\u957f\u5b57\u7b26\u4e32\u63d2\u56fe\" alt=\"js\u5982\u4f55\u5b58\u50a8\u8d85\u957f\u5b57\u7b26\u4e32\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u4f7f\u7528 JavaScript \u5b58\u50a8\u8d85\u957f\u5b57\u7b26\u4e32<\/strong><\/p>\n<p>\u5728 JavaScript \u4e2d\uff0c\u5b58\u50a8\u8d85\u957f\u5b57\u7b26\u4e32\u6709\u4e24\u79cd\u4e3b\u8981\u65b9\u6cd5\uff1a<\/p>\n<p><strong>1. \u5206\u5272\u5b57\u7b26\u4e32<\/strong><\/p>\n<p>\u5c06\u8d85\u957f\u5b57\u7b26\u4e32\u5206\u5272\u6210\u66f4\u5c0f\u7684\u5757\uff0c\u7136\u540e\u5c06\u6bcf\u4e2a\u5757\u5b58\u50a8\u5728\u5355\u72ec\u7684\u53d8\u91cf\u4e2d\u3002\u8fd9\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u6b65\u9aa4\u5b9e\u73b0\uff1a<\/p>\n<ul>\n<li>\u786e\u5b9a\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u3002<\/li>\n<li>\u8ba1\u7b97\u8981\u5206\u5272\u6210\u591a\u5c11\u4e2a\u5757\u3002<\/li>\n<li>\u4f7f\u7528 substring \u65b9\u6cd5\u5c06\u5b57\u7b26\u4e32\u5206\u5272\u6210\u76f8\u5e94\u6570\u91cf\u7684\u5757\u3002<\/li>\n<li>\u5c06\u6bcf\u4e2a\u5757\u5b58\u50a8\u5728\u5355\u72ec\u7684\u53d8\u91cf\u4e2d\u3002<\/li>\n<\/ul>\n<p>\u793a\u4f8b\uff1a<\/p>\n<pre>const longString = \"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.\";\n\n\/\/ \u8ba1\u7b97\u5b57\u7b26\u4e32\u957f\u5ea6\nconst stringLength = longString.length;\n\n\/\/ \u8ba1\u7b97\u8981\u5206\u5272\u6210\u591a\u5c11\u4e2a\u5757\nconst numChunks = Math.ceil(stringLength \/ 1000); \/\/ \u5047\u8bbe\u6bcf\u4e2a\u5757\u6700\u591a 1000 \u4e2a\u5b57\u7b26\n\n\/\/ \u5206\u5272\u5b57\u7b26\u4e32\nconst chunks = [];\nfor (let i = 0; i &lt; numChunks; i++) {\n  const start = i * 1000;\n  const end = Math.min(stringLength, start + 1000);\n  chunks.push(longString.substring(start, end));\n}\n\n\/\/ \u5c06\u5757\u5b58\u50a8\u5728\u5355\u72ec\u7684\u53d8\u91cf\u4e2d\nconst chunk1 = chunks[0];\nconst chunk2 = chunks[1];\n\/\/ ...<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p><strong>2. \u4f7f\u7528 Blob<\/strong><\/p>\n<p>Blob \u5bf9\u8c61\u5141\u8bb8\u5b58\u50a8\u8d85\u957f\u5b57\u7b26\u4e32\uff0c\u800c\u4e0d\u4f1a\u5360\u7528 JavaScript \u5806\u5185\u5b58\u3002\u6b64\u65b9\u6cd5\u6d89\u53ca\u4ee5\u4e0b\u6b65\u9aa4\uff1a<\/p>\n<ul>\n<li>\u521b\u5efa\u4e00\u4e2a Blob \u5bf9\u8c61\uff0c\u5176\u4e2d\u5305\u542b\u8d85\u957f\u5b57\u7b26\u4e32\u3002<\/li>\n<li>\u5c06 Blob \u5bf9\u8c61\u5b58\u50a8\u5728\u53d8\u91cf\u4e2d\u3002<\/li>\n<li>\u5728\u9700\u8981\u65f6\uff0c\u4f7f\u7528 FileReader \u8bfb\u53d6 Blob \u5bf9\u8c61\u4e2d\u7684\u5185\u5bb9\u3002<\/li>\n<\/ul>\n<p>\u793a\u4f8b\uff1a<\/p>\n<pre>\/\/ \u521b\u5efa Blob \u5bf9\u8c61\nconst blob = new Blob([longString]);\n\n\/\/ \u5c06 Blob \u5bf9\u8c61\u5b58\u50a8\u5728\u53d8\u91cf\u4e2d\nconst longStringBlob = blob;\n\n\/\/ \u8bfb\u53d6 Blob \u5bf9\u8c61\u4e2d\u7684\u5185\u5bb9\nconst fileReader = new FileReader();\nfileReader.onload = function() {\n  const string = fileReader.result;\n};\nfileReader.readAsText(blob);<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u6839\u636e\u6240\u9700\u7684\u6027\u80fd\u548c\u5185\u5b58\u9650\u5236\uff0c\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u3002\u5206\u5272\u5b57\u7b26\u4e32\u63d0\u4f9b\u4e86\u66f4\u9ad8\u7684\u8bbf\u95ee\u901f\u5ea6\uff0c\u800c Blob \u5219\u66f4\u9002\u5408\u5b58\u50a8\u975e\u5e38\u5927\u7684\u5b57\u7b26\u4e32\uff0c\u56e0\u4e3a\u5b83\u4eec\u4e0d\u4f1a\u5360\u7528 JavaScript \u5806\u5185\u5b58\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fjs\u5982\u4f55\u5b58\u50a8\u8d85\u957f\u5b57\u7b26\u4e32\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>\u4f7f\u7528 javascript \u5b58\u50a8\u8d85\u957f\u5b57\u7b26\u4e32\u6838\u5fc3\u7b54\u6848\uff1a\u4f7f\u7528 javascript \u5b58\u50a8\u8d85\u957f\u5b57\u7b26\u4e32\u6709\u4e24\u79cd\u5e38\u7528\u65b9\u6cd5\uff1a\u5206\u5272\u5b57\u7b26\u4e32\u548c\u4f7f\u7528 blob \u5bf9\u8c61\u3002\u8be6\u7ec6\u63cf\u8ff0\uff1a\u5206\u5272\u5b57\u7b26\u4e32\u5c06\u8d85\u957f\u5b57\u7b26\u4e32\u5206\u5272\u6210\u8f83\u5c0f\u7684\u5757\u3002\u5c06\u6bcf\u4e2a\u5757\u5b58\u50a8\u5728\u5355\u72ec\u7684\u53d8\u91cf\u4e2d\u3002\u4f7f\u7528 blob \u5bf9\u8c61\u521b\u5efa\u4e00\u4e2a blob \u5bf9\u8c61\uff0c\u5176\u4e2d\u5305\u542b\u8d85\u957f\u5b57\u7b26\u4e32\u3002\u5c06 blob \u5bf9\u8c61\u5b58\u50a8\u5728\u53d8\u91cf\u4e2d\u3002\u4f7f\u7528 filereader \u8bfb\u53d6 blob \u5bf9\u8c61\u4e2d\u7684\u5185\u5bb9\u3002 \u5982\u4f55\u4f7f\u7528 JavaScript \u5b58\u50a8\u8d85\u957f\u5b57\u7b26\u4e32 \u5728 JavaScript \u4e2d\uff0c\u5b58\u50a8\u8d85\u957f\u5b57\u7b26\u4e32\u6709\u4e24\u79cd\u4e3b\u8981\u65b9\u6cd5\uff1a 1. \u5206\u5272\u5b57\u7b26\u4e32 \u5c06\u8d85\u957f\u5b57\u7b26\u4e32\u5206\u5272\u6210\u66f4\u5c0f\u7684\u5757\uff0c\u7136\u540e\u5c06\u6bcf\u4e2a\u5757\u5b58\u50a8\u5728\u5355\u72ec\u7684\u53d8\u91cf\u4e2d\u3002\u8fd9\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u6b65\u9aa4\u5b9e\u73b0\uff1a \u786e\u5b9a\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u3002 \u8ba1\u7b97\u8981\u5206\u5272\u6210\u591a\u5c11\u4e2a\u5757\u3002 \u4f7f\u7528 substring \u65b9\u6cd5\u5c06\u5b57\u7b26\u4e32\u5206\u5272\u6210\u76f8\u5e94\u6570\u91cf\u7684\u5757\u3002 \u5c06\u6bcf\u4e2a\u5757\u5b58\u50a8\u5728\u5355\u72ec\u7684\u53d8\u91cf\u4e2d\u3002 \u793a\u4f8b\uff1a const longString = &#8220;Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. 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