{"id":34126,"date":"2024-11-25T10:30:39","date_gmt":"2024-11-25T02:30:39","guid":{"rendered":"https:\/\/fwq.ai\/blog\/34126\/"},"modified":"2024-11-25T10:30:39","modified_gmt":"2024-11-25T02:30:39","slug":"%e6%b7%b1%e5%85%a5%e8%81%8a%e8%81%8a%e5%b0%8f%e7%a8%8b%e5%ba%8f%e4%b8%ad%e6%80%8e%e4%b9%88%e8%bf%9b%e8%a1%8c%e5%9b%be%e7%89%87%e4%bc%98%e5%8c%96","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/34126\/","title":{"rendered":"\u6df1\u5165\u804a\u804a\u5c0f\u7a0b\u5e8f\u4e2d\u600e\u4e48\u8fdb\u884c\u56fe\u7247\u4f18\u5316"},"content":{"rendered":"

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\u56fe\u7247\u7f29\u653e<\/strong><\/h5>\n

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\/**\n * \u8bbe\u7f6e\u7f51\u7edc\u60c5\u51b5\n *\/\nconst setNetwork = (res: Record<string>) =&gt; {\n  const { isConnected = true, networkType = 'wifi' } = res;\n\n  this.globalData.isConnected = isConnected;\n  this.globalData.networkType = networkType.toLowerCase();\n  this.events.emit(EventsEnum.UPDATE_NETWORK, networkType);\n};\n\nwx.getNetworkType({ success: (res) =&gt; setNetwork(res) });\nwx.offNetworkStatusChange((res) =&gt; setNetwork(res));\nwx.onNetworkStatusChange((res) =&gt; setNetwork(res));<\/string><\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\/**\n * \u6839\u636e\u7f51\u7edc\u73af\u5883\u8bbe\u7f6e\u4e0d\u540c\u8d28\u91cf\u56fe\u7247\n *\/\nconst ImageQuality: Record<string> = {\n  wifi: 85,\n  '5g': 85,\n  '4g': 80,\n  '3g': 60,\n  '2g': 60,\n};\n\n\/**\n * \u83b7\u53d6\u56fe\u7247\u8d28\u91cf\n *\/\nexport const getImageQuality = () =&gt; ImageQuality[getApp().globalData.networkType ?? 'wifi'];<\/string><\/pre>\n
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\/\/ \u68c0\u67e5\u662f\u5426\u652f\u6301webp\u683c\u5f0f\nconst checkSupportWebp = () =&gt; {\n  const { system } = wx.getSystemInfoSync();\n  const [platform, version] = system.split(' ');\n\n  if (platform.toLocaleUpperCase() === PlatformEnum.IOS) {\n    return Number(version.split('.')[0]) &gt; IOS_VERSION_13;\n  }\n\n  return true; \/\/ \u9ed8\u8ba4\u652f\u6301webp\u683c\u5f0f\n};<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\n  \u63d0\u793a\uff1a\u7531\u4e8e\u76ee\u524d\u56fe\u7247\u670d\u52a1\u5668\u5e76\u4e0d\u652f\u6301\u3001SVG\u3001GIF\u8f6cWebP\uff0c\u5e76\u6ca1\u6709\u505a\u5904\u7406\n<\/p><\/blockquote>\n
\u4f18\u5316\u6548\u679c<\/strong><\/h4>\n
\u6d4b\u8bd5\u6211\u4eec\u5c0f\u7a0b\u5e8f\u9996\u9875\u5217\u8868\u63a5\u53e3\u52a0\u8f7d\u56fe\u7247\uff0c\u6765\u5bf9\u6bd4\u4f18\u5316\u524d\u540e\u7684\u6548\u679c<\/p>\n\n\n\n\n\n\n
\u4f18\u5316\u524d<\/th>\n\u56fe\u7247\u6570<\/th>\n\u4e0d\u652f\u6301 WebP<\/th>\n\u652f\u6301 WebP<\/th>\n<\/tr>\n<\/thead>\n
2300K<\/td>\n10<\/td>\n523K (\u964d\u4f4e 77%+)<\/td>\n315K (\u964d\u4f4e 86%+)<\/td>\n<\/tr>\n
248M<\/td>\n100<\/td>\n69M (\u964d\u4f4e 72%+)<\/td>\n38M (\u964d\u4f4e 84%+)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\"\u6df1\u5165\u804a\u804a\u5c0f\u7a0b\u5e8f\u4e2d\u600e\u4e48\u8fdb\u884c\u56fe\u7247\u4f18\u5316\u63d2\u56fe6\"<\/p>\n
\u7ecf\u8fc7\u6211\u4eec\u901a\u8fc7\u4f7f\u7528\u7684\u56fe\u7247\u5904\u7406\u529f\u80fd\uff0c\u4ee5\u53ca\u52a8\u6001\u5904\u7406\u56fe\u7247\u683c\u5f0f\u7684\u65b9\u5f0f\uff0c\u51cf\u5c11\u56fe\u7247\u4f53\u79ef\uff0c\u63d0\u9ad8\u56fe\u7247\u52a0\u8f7d\u901f\u5ea6\uff0c\u5e26\u6765\u7684\u6536\u76ca\u6bd4\u975e\u5e38\u53ef\u89c2\u7684<\/p>\n
\u56fe\u7247\u61d2\u52a0\u8f7d<\/strong><\/h3>\n
\u61d2\u52a0\u8f7d\u662f\u4e00\u79cd\u6027\u80fd\u4f18\u5316\u7684\u65b9\u5f0f\uff0c\u5c06\u9875\u9762\u5185\u672a\u51fa\u73b0\u5728\u53ef\u89c6\u533a\u57df\u5185\u7684\u56fe\u7247\u5148\u4e0d\u505a\u52a0\u8f7d\uff0c \u7b49\u5230\u6eda\u52a8\u5230\u53ef\u89c6\u533a\u57df\u540e\u518d\u53bb\u52a0\u8f7d\uff0c\u5bf9\u4e8e\u9875\u9762\u52a0\u8f7d\u6027\u80fd\u4e0a\u4f1a\u6709\u5f88\u5927\u7684\u63d0\u5347\uff0c\u4e5f\u63d0\u9ad8\u4e86\u7528\u6237\u4f53\u9a8c\u3002<\/p>\n
\u5b9e\u73b0\u539f\u7406<\/strong><\/p>\n
\u4f7f\u7528\u5c0f\u7a0b\u5e8f\u63d0\u4f9b\uff0c\u76d1\u542c\u67d0\u4e9b\u8282\u70b9\u662f\u5426\u53ef\u4ee5\u88ab\u7528\u6237\u770b\u89c1\u3001\u6709\u591a\u5927\u6bd4\u4f8b\u53ef\u4ee5\u88ab\u7528\u6237\u770b\u89c1\u3002\u8fd9\u6837\u6211\u4eec\u5c31\u80fd\u5224\u65ad\u56fe\u7247\u5143\u7d20\u662f\u5426\u5728\u53ef\u662f\u8303\u56f4\u4e2d\uff0c\u8fdb\u884c\u56fe\u7247\u52a0\u8f7d\u3002<\/p>\n
\u6211\u4eec\u57fa\u4e8e\u5c0f\u7a0b\u5e8f\u7684\uff0c\u5c01\u88c5\u4e00\u4e2a\u76d1\u542c\u6a21\u5757\u66dd\u5149 IntersectionObserver\u51fd\u6570\u5de5\u5177\uff0c\u63d0\u4f9b\u4ee5\u4e0b\u7528\u6cd5<\/p>\n
import IntersectionObserver from 'utils\/observer\/observer';\n\nconst ob = new IntersectionObserver({\n  selector: '.goods-item', \/\/ \u6307\u5b9a\u76d1\u542c\u7684\u76ee\u6807\u8282\u70b9\u5143\u7d20\n  observeAll: true, \/\/ \u662f\u5426\u540c\u65f6\u89c2\u6d4b\u591a\u4e2a\u76ee\u6807\u8282\u70b9\n  context: this, \/\/ \u5c0f\u7a0b\u5e8f this \u5bf9\u8c61\u5b9e\u4f8b\n  delay: 200, \/\/ \u8c03\u7528 onFinal \u65b9\u6cd5\u7684\u95f4\u9694\u65f6\u95f4\uff0c\u9ed8\u8ba4 200ms\n  onEach: ({ dataset }) =&gt; {\n    \/\/ \u6bcf\u4e00\u6b21\u89e6\u53d1\u76d1\u542c\u8c03\u7528\u65f6\uff0c\u89e6\u53d1 onEach \u65b9\u6cd5\uff0c\u53ef\u4ee5\u5bf9\u6570\u636e\u8fdb\u884c\u4e00\u4e9b\u8fc7\u6ee4\u5904\u7406\n    const { key } = dataset || {};\n    return key;\n  },\n  onFinal: (data) =&gt; {\n    \/\/ \u5728\u89e6\u53d1\u76d1\u542c\u8c03\u7528\u4e00\u6bb5\u65f6\u95f4 delay \u540e\uff0c\u4f1a\u8c03\u7528\u4e00\u6b21 onFinal \u65b9\u6cd5\uff0c\u53ef\u4ee5\u8fdb\u884c\u57cb\u70b9\u4e0a\u62a5\n    if (!data) return;\n    console.log('module view data', data);\n  },\n});\n\n\/\/ \u5185\u7f6e\u51fd\u6570\u65b9\u6cd5\uff0c\u5982\u4e0b\uff1a\nob.connect(); \/\/ \u5f00\u59cb\u76d1\u542c\nob.disconnect(); \/\/ \u505c\u6b62\u76d1\u542c\nob.reconnect(); \/\/ \u91cd\u7f6e\u76d1\u542c<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u7136\u540e\u5728\u6211\u4eec\u7684FreeImage\u56fe\u7247\u7ec4\u4ef6\uff0c\u6dfb\u52a0\u53ef\u89c6\u533a\u57df\u52a0\u8f7d\u56fe\u7247\u7684\u529f\u80fd\uff0c\u4ee5\u4e0b\u662f\u90e8\u5206\u4ee3\u7801<\/p>\n
import IntersectionObserver from 'utils\/observer';\n\nComponent({\n  properties: {\n    src: String,\n    \/**\n     * \u662f\u5426\u5f00\u542f\u53ef\u89c6\u533a\u57df\u52a0\u8f7d\u56fe\u7247\n     *\/\n    observer: {\n      type: Boolean,\n      value: false,\n    },\n    ....\n  },\n\n  data: {\n    isObserver: false,\n    ...\n  },\n\n  lifetimes: {\n    attached() {\n      \/\/ \u5f00\u542f\u53ef\u89c6\u533a\u57df\u52a0\u8f7d\u56fe\u7247\n      if (this.data.observer) {\n        this.createObserver();\n      }\n    },\n  },\n  methods: {\n    ...\n\n    \/**\n     * \u76d1\u542c\u56fe\u7247\u662f\u5426\u8fdb\u5165\u53ef\u89c6\u533a\u57df\n     *\/\n    createObserver() {\n      const ob = new IntersectionObserver({\n        selector: '.free-image',\n        observeAll: true,\n        context: this,\n        onFinal: (data = []) =&gt; {\n          data.forEach((item: any) =&gt; {\n            this.setData({\n              isObserver: true,\n            });\n            ob.disconnect(); \/\/ \u53d6\u6d88\u76d1\u542c\n          });\n        },\n      });\n\n      ob.connect(); \/\/ \u5f00\u59cb\u76d1\u542c\n    }\n  }\n})<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
<free-image><\/free-image><\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u4f18\u5316\u6548\u679c<\/strong><\/h4>\n
\u6d4b\u8bd5\u6211\u4eec\u5c0f\u7a0b\u5e8f\u9996\u9875\u5217\u8868\uff0c\u4f7f\u7528\u56fe\u7247\u61d2\u52a0\u8f7d\u7684\u6548\u679c<\/p>\n
\"\u6df1\u5165\u804a\u804a\u5c0f\u7a0b\u5e8f\u4e2d\u600e\u4e48\u8fdb\u884c\u56fe\u7247\u4f18\u5316\u63d2\u56fe7\"<\/p>\n
\u901a\u8fc7\u4f7f\u7528\u56fe\u7247\u61d2\u52a0\u8f7d\u7684\u529f\u80fd\uff0c\u51cf\u5c11\u56fe\u7247\u6570\u91cf\u7684\u52a0\u8f7d\uff0c\u6709\u6548\u63d0\u9ad8\u9875\u9762\u52a0\u8f7d\u6027\u80fd\u3002\u5728\u4e0a\u8ff0\u6211\u4eec\u5df2\u7ecf\u5bf9\u56fe\u7247\u4f53\u79ef\u8fdb\u884c\u4f18\u5316\u8fc7\uff0c\u6240\u4ee5\u5728\u6211\u4eec\u5c0f\u7a0b\u5e8f\u4e2d\uff0c\u53ea\u6709\u5728\u7f51\u7edc\u60c5\u51b5\u8f83\u5dee\u7684\u60c5\u51b5\u4e0b\uff0c\u624d\u4f1a\u81ea\u52a8\u5f00\u542f\u56fe\u7247\u61d2\u52a0\u8f7d\u529f\u80fd\u3002<\/p>\n
\u4f18\u5316\u8bf7\u6c42\u6570<\/strong><\/h3>\n
\u6211\u4eec\u9879\u76ee\u4e2d\u6709\u5f88\u591a\u672c\u5730\u56fe\u7247\u8d44\u6e90\uff0c\u6bd4\u5982\u4e00\u4e9b icon \u56fe\u6807\u3001\u6807\u7b7e\u7c7b\u5207\u56fe\u3001\u80cc\u666f\u56fe\u3001\u56fe\u7247\u6309\u94ae\u7b49\u3002\u800c\u5c0f\u7a0b\u5e8f\u5206\u5305\u5927\u5c0f\u662f\u6709\u9650\u5236\uff1a\u6574\u4e2a\u5c0f\u7a0b\u5e8f\u6240\u6709\u5206\u5305\u5927\u5c0f\u4e0d\u8d85\u8fc7 20M\uff0c\u800c\u5355\u4e2a\u5206\u5305\/\u4e3b\u5305\u5927\u5c0f\u4e0d\u80fd\u8d85\u8fc7 2M\u3002\u6240\u4ee5\u4e3a\u4e86\u51cf\u8f7b\u5c0f\u7a0b\u5e8f\u4f53\u79ef\uff0c\u672c\u5730\u56fe\u7247\u8d44\u6e90\u9700\u8981\u8fdb\u884c\u8c03\u6574\uff0c\u6bd4\u5982\u56fe\u7247\u538b\u7f29\u3001\u4e0a\u4f20\u5230 CDN \u670d\u52a1\u5668\u3002\u8fd9\u6837\u80fd\u51cf\u5c11\u4e86\u5c0f\u7a0b\u5e8f\u4e3b\u5305\u5927\u5c0f\uff0c\u800c\u5927\u90e8\u5206\u56fe\u7247\u90fd\u5728\u817e\u8baf\u4e91 CDN \u670d\u52a1\u5668\u4e2d\uff0c\u867d\u7136\u53ef\u4ee5\u52a0\u901f\u8d44\u6e90\u7684\u8bf7\u6c42\u901f\u5ea6\uff0c\u5f53\u9875\u9762\u6253\u5f00\u9700\u8981\u540c\u65f6\u4e0b\u8f7d\u5927\u91cf\u7684\u56fe\u7247\u7684\u8bdd\uff0c\u5c31\u4f1a\u4e25\u91cd\u5f71\u54cd\u4e86\u7528\u6237\u7684\u4f7f\u7528\u4f53\u9a8c\u3002<\/p>\n
\u9488\u5bf9\u6b64\u95ee\u9898\uff0c\u9700\u8981\u627e\u5230\u6743\u8861\u70b9\u6765\u5b9e\u73b0\u6765\u4f18\u5316\u8bf7\u6c42\u6570\uff0c\u9996\u5148\u6211\u4eec\u628a\u56fe\u7247\u8d44\u6e90\u8fdb\u884c\u5206\u7c7b\uff0c\u4ee5\u53ca\u4f7f\u7528\u573a\u666f\uff0c\u6700\u540e\u786e\u5b9a\u6211\u4eec\u65b9\u6848\u5982\u4e0b\uff1a<\/p>\n
    \n
  • \u8f83\u5927\u4f53\u79ef\u7684\u56fe\u7247\uff0c\u9009\u62e9\u4e0a\u4f20\u5230 CDN \u670d\u52a1\u5668<\/li>\n
  • \u5355\u8272\u56fe\u6807\u4f7f\u7528 iconfont \u5b57\u4f53\u56fe\u6807\uff0c\u591a\u5f69\u56fe\u6807\u5219\u4f7f\u7528svg\u683c\u5f0f<\/li>\n
  • \u6807\u7b7e\u7c7b\u7684\u56fe\u7247\uff0c\u5219\u751f\u6210\u96ea\u78a7\u56fe\u4e4b\u540e\u4e0a\u4f20\u5230 CDN \u670d\u52a1\u5668<\/li>\n
  • \u56fe\u7247\u4f53\u79ef\u5c0f\u4e8e10KB\uff0c\u7ed3\u5408\u4f7f\u7528\u573a\u666f\uff0c\u5219\u8003\u8651base64 \uff0c\u6bd4\u5982\u4e00\u5f20\u56fe\u7247\u4f53\u79ef\u4e3a3KB\u7684\u80cc\u666f\u56fe\uff0c\u7531\u4e8e\u5c0f\u7a0b\u5e8fcss background\u4e0d\u652f\u6301\u672c\u5730\u56fe\u7247\u5f15\u5165\uff0c\u53ef\u4ee5\u4f7f\u7528 base64 \u65b9\u5f0f\u5b9e\u73b0<\/li>\n<\/ul>\n
    \u5176\u4ed6\u7b56\u7565<\/strong><\/h3>\n
    \u5927\u56fe\u68c0\u6d4b<\/strong><\/h5>\n
    \u5b9e\u73b0\u5927\u56fe\u68c0\u6d4b\u673a\u5236\uff0c\u53ca\u65f6\u53d1\u73b0\u56fe\u7247\u4e0d\u7b26\u5408\u89c4\u8303\u7684\u95ee\u9898\uff0c\u5f53\u53d1\u73b0\u56fe\u7247\u5c3a\u5bf8\u592a\u5927\uff0c\u4e0d\u7b26\u5408\u5546\u54c1\u56fe\u5c3a\u5bf8\u6807\u51c6\u65f6\u4f1a\u8fdb\u884c\u4e0a\u62a5\u3002\u5728\u5c0f\u7a0b\u5e8f\u5f00\u53d1\u7248\/\u4f53\u9a8c\u7248\u4e2d\uff0c\u5f53\u6211\u4eec\u8bbe\u7f6e\u5f00\u542fDebug\u6a21\u5f0f\uff0c\u56fe\u7247\u7ec4\u4ef6FreeImage\u4f1a\u81ea\u52a8\u68c0\u6d4b\u5230\u5927\u56fe\u7247\u65f6\uff0c\u663e\u793a\u5f53\u524d\u56fe\u7247\u5c3a\u5bf8\u3001\u4ee5\u53ca\u8bbe\u7f6e\u56fe\u7247\u9ad8\u4eae\/\u7ffb\u8f6c\u7684\u65b9\u5f0f\u63d0\u9192\u8fd0\u8425\u540c\u5b66\u548c\u8bbe\u8ba1\u540c\u5b66\u8fdb\u884c\u5904\u7406<\/p>\n
    \"\u6df1\u5165\u804a\u804a\u5c0f\u7a0b\u5e8f\u4e2d\u600e\u4e48\u8fdb\u884c\u56fe\u7247\u4f18\u5316\u63d2\u56fe8\"<\/p>\n
    \u52a0\u8f7d\u5931\u8d25\u5904\u7406<\/strong><\/h5>\n
    \u4f7f\u7528\u817e\u8baf\u4e91\u56fe\u7247\u5904\u7406\u529f\u80fd\uff0cURL\u9884\u5904\u7406\u8f6c\u6362\u540e\u5f97\u65b0 URL\uff0c\u53ef\u80fd\u4f1a\u5b58\u5728\u5c11\u91cf\u56fe\u7247\u4e0d\u5b58\u5728\u7684\u5f02\u5e38\u573a\u666f\u5bfc\u81f4\u52a0\u8f7d\u5931\u8d25\u3002\u9047\u5230\u56fe\u7247\u52a0\u8f7d\u5931\u8d25\u65f6\uff0c\u6211\u4eec\u8fd8\u662f\u9700\u8981\u91cd\u65b0\u52a0\u8f7d\u539f\u59cb\u56fe\u7247 URL, \u4e4b\u540e\u4f1a\u5c06\u9519\u8bef\u56fe\u7247 URL \u4e0a\u62a5\u5230\u76d1\u63a7\u5e73\u53f0\uff0c\u65b9\u4fbf\u4e4b\u540e\u8c03\u6574 URL \u9884\u5904\u7406\u8f6c\u6362\u89c4\u5219\uff0c\u540c\u65f6\u4e5f\u53d1\u73b0\u4e00\u90e8\u5206\u9519\u8bef\u7684\u56fe\u7247 URL \u63a8\u52a8\u4e1a\u52a1\u4fee\u6539\u3002<\/p>\n
    \u8fd9\u662f\u6211\u4eec\u56fe\u7247\u7ec4\u4ef6FreeImage \u5904\u7406\u56fe\u7247\u52a0\u8f7d\u5931\u8d25\uff0c\u4ee5\u4e0b\u662f\u90e8\u5206\u4ee3\u7801<\/p>\n
    onError(event: WechatMiniprogram.TouchEvent) {\n  const { src, useCosImage } = this.data;\n\n  this.setData({\n    loading: false,\n    error: true,\n    lazy: 'error',\n  });\n\n  \/\/ \u5224\u65ad\u662f\u5426\u817e\u8baf\u4e91\u670d\u52a1\u7684\u56fe\u7247\n  if (useCosImage) {\n    wx.nextTick(() =&gt; {\n      \/\/ \u91cd\u65b0\u52a0\u8f7d\u539f\u751f\u56fe\u7247\n      this.setData({\n        formattedSrc: src, \/\/ src \u662f\u539f\u56fe\u5730\u5740\n      });\n    });\n  }\n\n  \/\/ \u4e0a\u62a5\u56fe\u7247\u52a0\u8f7d\u5931\u8d25\n  app.aegis.report(AegisEnum.IMAGE_LOAD_FAIL, {\n    src,\n    errMsg: event?.detail.errMsg,\n  });\n\n  this.triggerEvent('error', event.detail);\n}<\/pre>\n
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export const getImageQuality = () =&gt; ImageQuality[getApp().globalData.networkType ?? ‘wifi’];<\/string> 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