\u5728\u505a\u5c0f\u7a0b\u5e8f\u7684\u65f6\u5019\uff0c\u662f\u4e0d\u662f\u7ecf\u5e38\u9047\u5230\u8fd9\u4e24\u79cd\u540c\u6b65\u95ee\u9898\uff1a<\/p>\n
1.\u4f7f\u7528for\u5faa\u73af\uff0c\u4e00\u4e2a\u5faa\u73af\u91cc\u9762\u7684\u64cd\u4f5c\u8fd8\u6ca1\u7ed3\u675f\uff0c\u4e0b\u4e00\u4e2a\u5faa\u73af\u5c31\u5df2\u7ecf\u5f00\u59cb\u4e86\u3002\u5982\u679c\u5faa\u73af\u4e4b\u95f4\u6ca1\u6709\u4e92\u76f8\u4f9d\u8d56\uff0c\u95ee\u9898\u5e94\u8be5\u8fd8\u4e0d\u5927\uff0c\u4f46\u662f\u5982\u679c\u4e0b\u4e00\u4e2a\u5faa\u73af\u7684\u5f00\u59cb\u4f9d\u8d56\u4e8e\u4e0a\u4e00\u4e2a\u5faa\u73af\u7684\u7ed3\u679c\uff0c\u90a3\u8fd9\u4e00\u7cfb\u5217\u64cd\u4f5c\u5c31\u4f1a\u51fa\u73b0\u95ee\u9898\uff0c\u6bd4\u5982\u753b\u56fe\uff1a<\/p>\n
for (let index in images) {\n \/\/\u6bcf\u753b\u4e00\u5f20\u56fe\uff0c\u90fd\u8981\u5728\u4e0a\u4e00\u5f20\u56fe\u753b\u7ed3\u675f\u624d\u80fd\u5f00\u59cb\uff0c\u56e0\u4e3a\u8981\u8ba1\u7b97\u753b\u56fe\u4f4d\u7f6e\n ctx.drawImage\n}<\/pre>\n \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
2.\u8c03\u7528\u670d\u52a1\u5668\u63a5\u53e3\u8bbf\u95ee\u6570\u636e\u3001\u4e0b\u8f7d\u56fe\u7247\u7b49\uff0c\u670d\u52a1\u5668\u8fd8\u672a\u8fd4\u56de\u6570\u636e\uff0c\u4ee3\u7801\u5df2\u7ecf\u7ee7\u7eed\u6267\u884c\u5176\u4ed6\u4ee3\u7801\u4e86\uff0c\u8fd9\u660e\u663e\u4f1a\u51fa\u95ee\u9898\u3002<\/p>\n
wx.downloadFile({\n url: URL,\n success(wr) {\n \/\/\u5982\u679c\u5176\u4ed6\u6267\u884c\u4ee3\u7801\u5728success\u4ee3\u7801\u5757\u91cc\u9762\uff0c\u8fd8\u80fd\u4fdd\u8bc1\u5728\u6210\u529f\u83b7\u53d6\u6570\u636e\u540e\u6b63\u5e38\u6267\u884c\n \/\/\u5982\u679c\u4e0b\u8f7d\u529f\u80fd\u662f\u5171\u7528\u7684\uff0c\u5176\u4ed6\u64cd\u4f5c\u903b\u8f91\u80af\u5b9a\u5c31\u4f1a\u62bd\u79bb\u51fa\u6765\uff0c\u8fd9\u6837\u5c31\u4fdd\u8bc1\u4e0d\u4e86\u540c\u6b65\u6267\u884c\u4e86\u3002\n }\n});<\/pre>\n \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u8be5\u600e\u4e48\u89e3\u51b3\u5462\uff1f
\u7b2c\u4e00\u79cd\u60c5\u51b5\uff0c\u7f51\u4e0a\u597d\u591a\u89e3\u51b3\u65b9\u6848\u662f\u52a0sync\u6216\u8005await\uff0c\u8fd8\u6709\u7684\u52a0setInterval\uff0c\u8fd9\u51e0\u79cd\u65b9\u6848\u6211\u90fd\u6ca1\u6709\u9009\uff0c\u800c\u4e14\u4f7f\u7528\u5d4c\u5957\u8c03\u7528\u3002<\/p>\n
\/**\n * \u5904\u7406\u56fe\u7247\n *\/\n handleOneImage: function(ctx, images, idx) {\n let that = this;\n let oneImage = images[idx];\n let pro = new Promise(function(resolve, reject) {\n if (oneImage == undefined) {\n \/\/\u753b\u56fe\u7ed3\u675f\n \/\/\u6267\u884c\u4e00\u7cfb\u5217\u64cd\u4f5c\n } else {\n \/\/\u6210\u529f\u753b\u56fe\u7ed3\u675f\uff0c\u6267\u884c\u4e0b\u4e00\u5f20\u56fe\u7684\u64cd\u4f5c\n that.drawOneImage(ctx, oneImage, that.data.xp).then(isSuccess => {\n if (isSuccess == 'success') {\n that.handleOneImage(ctx, images, idx + 1);\n }\n });\n }\n });\n return pro;\n },\n \/**\n * \u753b\u56fe\u7247\n *\/\n drawOneImage: function(ctx, image, xp) {\n let that = this;\n \/\/\u4fdd\u8bc1\u83b7\u53d6\u56fe\u7247\u4fe1\u606f\u3001\u753b\u56fe\u7b49\u64cd\u4f5c\u540c\u6b65\u8fdb\u884c\u7ed3\u675f\u518d\u8fd4\u56de\u7ed3\u679c\n let pro = new Promise(function(resolve, reject) {\n wx.getImageInfo({\n src: image,\n success: function(imageInfo) {\n let iWidth = imageInfo.width;\n let iHeight = imageInfo.height;\n let dWidth = (iWidth * 580) \/ iHeight;\n ctx.drawImage(image, xp, 0, dWidth, 580);\n ctx.stroke();\n that.setData({\n xp: that.data.xp + dWidth\n });\n resolve('success');\n }\n });\n });\n return pro;\n },<\/pre>\n \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u7b2c\u4e8c\u79cd\u60c5\u51b5\uff1a\u5176\u5b9e\u5728\u89e3\u51b3\u7b2c\u4e00\u79cd\u60c5\u51b5\u7684\u4ee3\u7801\u4e2d\uff0c\u4e5f\u7528\u5230\u4e86\u89e3\u51b3\u7b2c\u4e8c\u79cd\u60c5\u51b5\u7684\u4ee3\u7801\uff0c\u4f7f\u7528Promise\uff0c\u6709\u9700\u8981\u7684\u8bdd\u53ef\u4ee5\u7814\u7a76\u4e0b\u4e0a\u9762\u7684\u4ee3\u7801\u3002<\/p>\n
\u8fd9\u4e9b\u89e3\u51b3\u65b9\u6848\u4e5f\u662f\u6211\u7684\u4e00\u4e2a\u5c0f\u7a0b\u5e8f\u91cc\u9762\u7684\u4ee3\u7801\u7247\u6bb5\uff0c\u5c0f\u7a0b\u540d\u5b57\u53eb\u56fe\u4f5c\u5996\uff0c\u4e00\u4e2a\u5c0f\u800c\u7f8e\u7684\u56fe\u7247\u5408\u6210\u3001\u526a\u5207\u5c0f\u7a0b\u5e8f\uff0c\u6b22\u8fce\u5927\u5bb6\u4f53\u9a8c\u3002<\/p>\n
\u63a8\u8350\u6559\u7a0b\uff1a\u300a\u300b<\/p>\n
\u4ee5\u4e0a\u5c31\u662f\u5c0f\u7a0b\u5e8f\u4e2d\u89e3\u51b3\u4ee3\u7801\u540c\u6b65\u6267\u884c\u7684\u95ee\u9898\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":"
\u5728\u505a\u5c0f\u7a0b\u5e8f\u7684\u65f6\u5019\uff0c\u662f\u4e0d\u662f\u7ecf\u5e38\u9047\u5230\u8fd9\u4e24\u79cd\u540c\u6b65\u95ee\u9898\uff1a 1.\u4f7f\u7528for\u5faa\u73af\uff0c\u4e00\u4e2a\u5faa\u73af\u91cc\u9762\u7684\u64cd\u4f5c\u8fd8\u6ca1\u7ed3\u675f\uff0c\u4e0b\u4e00\u4e2a\u5faa\u73af\u5c31\u5df2\u7ecf\u5f00\u59cb\u4e86\u3002\u5982\u679c\u5faa\u73af\u4e4b\u95f4\u6ca1\u6709\u4e92\u76f8\u4f9d\u8d56\uff0c\u95ee\u9898\u5e94\u8be5\u8fd8\u4e0d\u5927\uff0c\u4f46\u662f\u5982\u679c\u4e0b\u4e00\u4e2a\u5faa\u73af\u7684\u5f00\u59cb\u4f9d\u8d56\u4e8e\u4e0a\u4e00\u4e2a\u5faa\u73af\u7684\u7ed3\u679c\uff0c\u90a3\u8fd9\u4e00\u7cfb\u5217\u64cd\u4f5c\u5c31\u4f1a\u51fa\u73b0\u95ee\u9898\uff0c\u6bd4\u5982\u753b\u56fe\uff1a for (let index in images) { \/\/\u6bcf\u753b\u4e00\u5f20\u56fe\uff0c\u90fd\u8981\u5728\u4e0a\u4e00\u5f20\u56fe\u753b\u7ed3\u675f\u624d\u80fd\u5f00\u59cb\uff0c\u56e0\u4e3a\u8981\u8ba1\u7b97\u753b\u56fe\u4f4d\u7f6e ctx.drawImage } \u767b\u5f55\u540e\u590d\u5236 2.\u8c03\u7528\u670d\u52a1\u5668\u63a5\u53e3\u8bbf\u95ee\u6570\u636e\u3001\u4e0b\u8f7d\u56fe\u7247\u7b49\uff0c\u670d\u52a1\u5668\u8fd8\u672a\u8fd4\u56de\u6570\u636e\uff0c\u4ee3\u7801\u5df2\u7ecf\u7ee7\u7eed\u6267\u884c\u5176\u4ed6\u4ee3\u7801\u4e86\uff0c\u8fd9\u660e\u663e\u4f1a\u51fa\u95ee\u9898\u3002 wx.downloadFile({ url: URL, success(wr) { \/\/\u5982\u679c\u5176\u4ed6\u6267\u884c\u4ee3\u7801\u5728success\u4ee3\u7801\u5757\u91cc\u9762\uff0c\u8fd8\u80fd\u4fdd\u8bc1\u5728\u6210\u529f\u83b7\u53d6\u6570\u636e\u540e\u6b63\u5e38\u6267\u884c \/\/\u5982\u679c\u4e0b\u8f7d\u529f\u80fd\u662f\u5171\u7528\u7684\uff0c\u5176\u4ed6\u64cd\u4f5c\u903b\u8f91\u80af\u5b9a\u5c31\u4f1a\u62bd\u79bb\u51fa\u6765\uff0c\u8fd9\u6837\u5c31\u4fdd\u8bc1\u4e0d\u4e86\u540c\u6b65\u6267\u884c\u4e86\u3002 } }); \u767b\u5f55\u540e\u590d\u5236 \u8be5\u600e\u4e48\u89e3\u51b3\u5462\uff1f\u7b2c\u4e00\u79cd\u60c5\u51b5\uff0c\u7f51\u4e0a\u597d\u591a\u89e3\u51b3\u65b9\u6848\u662f\u52a0sync\u6216\u8005await\uff0c\u8fd8\u6709\u7684\u52a0setInterval\uff0c\u8fd9\u51e0\u79cd\u65b9\u6848\u6211\u90fd\u6ca1\u6709\u9009\uff0c\u800c\u4e14\u4f7f\u7528\u5d4c\u5957\u8c03\u7528\u3002 \/** * \u5904\u7406\u56fe\u7247 *\/ handleOneImage: function(ctx, images, idx) { let that = this; let oneImage = images[idx]; let pro = new Promise(function(resolve, reject) { if (oneImage == undefined) { \/\/\u753b\u56fe\u7ed3\u675f \/\/\u6267\u884c\u4e00\u7cfb\u5217\u64cd\u4f5c […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19],"tags":[],"class_list":["post-33436","post","type-post","status-publish","format-standard","hentry","category-19"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/33436","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=33436"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/33436\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=33436"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=33436"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=33436"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}