{"id":2228,"date":"2020-04-18T23:12:16","date_gmt":"2020-04-18T15:12:16","guid":{"rendered":"http:\/\/ufqi.com\/blog\/?p=2228"},"modified":"2020-04-19T14:11:47","modified_gmt":"2020-04-19T06:11:47","slug":"hanjst-showimage-dotpos","status":"publish","type":"post","link":"https:\/\/ufqi.com\/blog\/hanjst-showimage-dotpos\/","title":{"rendered":"\ud83d\ude4bHanjst\u6c49\u5409\u65af\u7279\u5347\u7ea7:+showImageAsync\u53ca\u6027\u80fd\u6539\u8fdb\u7b49"},"content":{"rendered":"

\u81ea2019\u5e74\u5143\u65e6\ud83d\ude4b<\/span>Hanjst\u6c49\u5409\u65af\u7279 \u6a21\u677f\u8bed\u8a00\u53ca\u5176\u7f16\u8bd1\u5f15\u64ce\u53d1\u5e03\uff0c\u5df2\u7ecf\u8fc7\u53bb\u4e00\u5e74\u591a\u4e86\u3002<\/p>\n

\u8fd9\u671f\u95f4\u968f\u7740 \ud83d\ude4b<\/span>Hanjst\u6c49\u5409\u65af\u7279 \u7684\u63a8\u5e7f\u5e94\u7528\uff0c\u6211\u4eec\u4e5f\u9646\u7eed\u53d1\u5e03\u4e86\u5982\u4e0b\u4e00\u4e9b\u66f4\u65b0\u5185\u5bb9\uff1a
\ud83d\udee0\ufe0fHanjst\/\u6c49\u5409\u65af\u7279\u66f4\u65b0\u52a0JavaScript\u8fd0\u884c\u65f6\u4f18\u5316\u7b49<\/a>\uff0c
\u6c49\u5409\u65af\u7279Hanjst+\u66f4\u65b0\u5347\u7ea7:error reporting, innerLoop\u548cloadingLayer<\/a>\uff0c
\u6c49\u5409\u65af\u7279Hanjst\u6a21\u677f\u8bed\u8a00\u53ca\u5f15\u64ce\u5728\u7ebf\u6587\u6863Doc&API\u9996\u53d1<\/a>\u3002<\/p>\n

\u6700\u8fd1\u53c8\u5bf9Hanjst\u6c49\u5409\u65af\u7279\u8fdb\u884c\u4e86\u4e00\u4e9b\u66f4\u65b0\uff0c\u5206\u522b\u53d9\u8ff0\u5982\u4e0b\uff0c\u4ee5\u5907\u67e5\u5907\u5fd8\u3002<\/p>\n

1. \u5347\u7ea7: \u589e\u52a0API\u63a5\u53e3\u51fd\u6570 Hanjst.showImageAsync, \u7528\u4e8e\u663e\u793aHTML\u7684\u56fe\u7247\u5143\u7d20<\/strong><\/p>\n

1.1. \u80cc\u666f\u53ca\u95ee\u9898<\/strong><\/p>\n

<img src=”{$imgPath}” alt=”” \/>
\u8be5\u8bed\u53e5\u5728 Hanjst \u8c03\u7528\u4e4b\u524d\u4f1a\u9020\u6210\u4e00\u6b21\u5bf9\u670d\u52a1\u5668\u7aef\u4e0d\u5b58\u5728\u7684\u56fe\u7247\u6587\u4ef6 \u201c{$imgPath}\u201d \u7684\u65e0\u6548\u8bf7\u6c42\u3002
\u82e5\u975e\u670d\u52a1\u5668\u7aef\u505a\u4e86\u4e00\u4e9b\u57fa\u4e8e .htaccess \u7684\u6307\u5411\uff0c\u8fd9\u4e2a\u8bf7\u6c42\u591a\u6570\u60c5\u51b5\u4e0b\u4f1a\u8fd4\u56de 404 \u9519\u8bef\u3002\u5b9e\u9645\u662f\u65e0\u610f\u4e49\u7684\u64cd\u4f5c\uff0c\u5e94\u8be5\u8bbe\u6cd5\u907f\u514d\u3002<\/p>\n

1.2. \u89e3\u51b3\u601d\u8def\u65b9\u6cd5<\/strong>
\u89e3\u6790HTML\u7684\u9875\u9762\u5143\u7d20 <img \u662f\u7531\u6d4f\u89c8\u5668\u7684\u9875\u9762\u89e3\u6790\u5f15\u64ce\u89e6\u53d1\uff0c\u56e0\u6b64\u5728\u6d41\u7a0b\u4e0a\u65e0\u6cd5\u963b\u6b62\u5bf9 <img \u7684\u89e3\u6790\u3002\u53ef\u884c\u7684\u601d\u8def\u662f\u53ef\u4ee5\u5728 <img \u7684\u5c5e\u6027src\u4e0a\u505a\u6587\u7ae0\uff0c\u4e5f\u5373\u7ed9 src \u4e00\u4e2a\u786e\u5b9a\u7684\uff0c\u6ca1\u6709 Hanjst\u6c49\u5409\u65af\u7279\u53d8\u91cf\u7684\u503c\uff0c\u8fd9\u6837\u5728\u52a0\u8f7d\u65f6\uff0c\u5c31\u4e0d\u4f1a\u6709\u5f02\u5e38\u629b\u51fa\uff0c\u7136\u540e\u5728\u901a\u8fc7\u67d0\u79cd\u673a\u5236\uff0c\u8ba9\u771f\u6b63\u7684 src\u503c\u91cd\u8f7d\u5230\u8fd9\u4e2a <img \u5143\u7d20\u4e0a\u53bb\u3002<\/p>\n

\u7ed9HTML\u4e2d\u7684 img \u5143\u7d20\u627e\u4e00\u4e2a\u5408\u6cd5\u5408\u7406\u7684 src\u503c\u5e76\u4e0d\u5bb9\u6613\uff0c\u5728\u7f51\u4e0a\u5df2\u7ecf\u8ba8\u8bba\u4e86\u5f88\u591a\uff0csrc\u503c\u5982\u679c\u662f\u201c\u201d \u7a7a\u503c\uff08src=\u201c\u201d\uff09\u7684\u8bdd\uff0c\u5f80\u5f80\u4f1a\u5bfc\u81f4\u91cd\u65b0\u52a0\u8f7d\u4e00\u6b21\u5f53\u524d\u9875\u9762\u4f5c\u4e3a\u5f53\u524dimg\u7684\u6570\u636e\u6e90\uff0c\u8fd9\u663e\u7136\u4e0d\u662f\u9884\u671f\u7684\u6548\u679c\uff0c\u540c\u6837\u7684\uff0csrc=\u201c#\u201d\uff0c src=\u201cjavascript:\u201d, src=”about:blank”,\u00a0 src=”\/\/:0″ \u7b49\u7b49\u90fd\u4e0d\u662f\u5f88\u7406\u60f3\u3002<\/p>\n

\u7ecf\u8fc7\u4e00\u756a\u63a2\u7d22\uff0c\u6211\u4eec\u89c9\u5f97\u7ed9src\u80fd\u591f\u83b7\u53d6\u9884\u671f\u7684\u6548\u679c\u7684\u6709\u4e24\u79cd\u601d\u8def\uff1a
A. \u7ed9\u4e88 src=”img\/default.png” , \u7ed9\u4e00\u4e2a\u9ed8\u8ba4\u7f3a\u7701\u56fe\u7247\u8def\u5f84\uff1b
B. \u7ed9\u4e0e src=”data:image\/png;base64,MA==” , \u7ed9\u4e0e\u4e00\u4e2a\u5185\u5bb9\u4e3a 0 \u7684base64\u56fe\u7247\u503c\u3002<\/p>\n

\u6709\u4e86\u56fe\u7247\u7684src\u66ff\u4ee3\u503c\uff0c\u7136\u540e\u518d\u4f7f\u7528 data-src \u5f15\u5165\u56fe\u7247\u7684\u771f\u5b9e\u7684src\u503c\uff0c\u901a\u8fc7JavaScript\u5728\u9875\u9762\u5143\u7d20\u52a0\u8f7d\u5b8c\u6210\u540e\uff0c\u5c06data-src\u503c\u6b63\u5f0f\u5199\u5165\u5230\u5f53\u524d\u7684 <img \u5143\u7d20\u4e2d\u53bb\u3002<\/p>\n

\u4e0b\u4e00\u4e2a\u5f85\u8003\u8651\u7684\u95ee\u9898\u5c31\u662f\uff0c\u5982\u4f55\u8c03\u7528\u8fd9\u6837\u4e00\u4e2a\u65b9\u6cd5\u6216\u8005\u5bf9\u8c61\uff0c\u6bd4\u5982\u5728 Hanjst\u91cc\u589e\u52a0\u4e86 showImageAsync, \u5f15\u7528\u65f6\uff0c\u662f\u5199\u4f5c\uff1a Hanjst.showImageAsync \uff0c \u8fd8\u662f\u5c06\u8fd9\u4e2a\u65b9\u6cd5\u8f93\u51fa\u5230\u5168\u5c40\u53d8\u91cf window\u4e0a\u53bb\uff0c\u5199\u4f5c\u00a0 window.showImageAsync \u6216\u8005 showImageAsync ?<\/p>\n

\u7ecf\u8fc7\u4e00\u756a\u601d\u8003\uff0c\u6211\u4eec\u5ba1\u614e\u5730\u5c06 showImageAsync \u8f93\u51fa\u5230\u5168\u5c40\u53d8\u91cf window \u4e0a\u3002\u8fd9\u6837\u5728\u4f7f\u7528\u65f6\uff0c\u53ef\u4ee5\u76f4\u63a5\u8c03\u7528\uff0c \u5199\u4f5c\uff1a showImageAync(imgId) \u3002<\/p>\n

1.3. \u6837\u4f8b<\/strong><\/p>\n

\u4fee\u6539\u524d:
….
<img src=”{$imgPath}” alt=””\/>
…<\/p>\n

\u4fee\u6539\u540e:
…
<img src=”data:image\/png;base64,MA==” alt=”” id=”{$imgId}” data-src=”{$imgPath}”\/>
{$showImageAsync($imgId)}
…<\/p>\n

1.4. \u6269\u5c55\u652f\u6301\u66f4\u591a\u56fe\u7247\u5f02\u6b65\u52a0\u8f7d<\/strong>
\u56fe\u7247\u5f02\u6b65\u52a0\u8f7d\uff0c\u5bf9\u6539\u5584\u9875\u9762\u5728\u4f4e\u901f\u7f51\u7edc\u4e0b\u7684\u8868\u73b0\u6709\u6781\u5927\u7684\u5e2e\u52a9\u3002\u6211\u4eec\u5728 \u5199\u51995G\u7f51\u901f\u53ca\u9875\u9762\u63d0\u901f\u4e2d\u7684\u5ef6\u8fdf\u52a0\u8f7dLazyloading<\/a>\uff08https:\/\/ufqi.com\/blog\/5g-network-speed-webpage-lazyloading\/<\/a>\uff09 \u4e2d\u8fdb\u884c\u4e86\u63cf\u8ff0\uff0c\u5982\u679c\u5728 Hanjst\u6c49\u5409\u65af\u7279\u4e2d\u9ed8\u8ba4\u5c31\u96c6\u6210\u4e86\u8fd9\u6837\u7684\u529f\u80fd\uff0c\u6216\u8005\u6574\u4e2a Hanjst\u6216\u8005\u6574\u4e2a\u9875\u9762\u7684\u8868\u73b0\u5177\u6709\u8f83\u5927\u7684\u5e2e\u52a9\u3002<\/p>\n

\u5728\u975e\u4e0a\u8ff0\u60c5\u51b5\u4e0b\u7684\u4e00\u4e9b\u573a\u666f\u4e2d\uff0c\u4e5f\u53ef\u4ee5\u4e3b\u52a8\u5f15\u5165 showImageAsync \u6765\u4f7f\u5f97\u56fe\u7247\u80fd\u591f\u5f02\u6b65\u52a0\u8f7d\u3002\u8fd9\u4e00\u70b9\u53ef\u7b97\u662f\u989d\u5916\u6536\u83b7\uff0c\u4e70\u4e00\u8d60\u4e00\u3002<\/p>\n

2. \u6539\u8fdb\uff1a\u5f15\u5165\u5c40\u90e8 bracketPos \u548c dotPos \uff0c\u7528\u4e8e\u5224\u65ad\u6a21\u677f\u8bed\u8a00\u7684\u8868\u8ff0<\/strong><\/p>\n

2.1. \u80cc\u666f\u53ca\u95ee\u9898<\/strong><\/p>\n

1)\u00a0 {$aFunc(0.2)}\u00a0 –> \u89e3\u6790\u6709\u8bef\u3002<\/p>\n

\u5728Hanjst\u7684\u8bed\u6cd5\u5b9a\u4e49\u4e2d\uff0c\u8981\u5728\u5f53\u524d\u4f4d\u7f6e\u663e\u793a\u4e00\u4e2a\u53d8\u91cf\uff0c\u76f4\u63a5\u4f7f\u7528\u5982\u4e0b\u5199\u6cd5\u5373\u53ef\uff1a
2)\u00a0{$var}<\/p>\n

\u540c\u65f6\u8fd9\u4e2a\u5b57\u7b26\u548c\u540e\u9762\u7684\u8868\u8fbe\u5f0f\u8fd8\u53ef\u4ee5\u8868\u793a\u66f4\u591a\u7684\u610f\u4e49\uff1a
3)\u00a0{$aFunc()} –> \u6267\u884c aFunc\u51fd\u6570\u5e76\u5c06\u7ed3\u679c\u663e\u793a\u5728\u5f53\u524d\u4f4d\u7f6e\uff1b
4)\u00a0{$aFunc($var)} –> \u643a\u5e26\u53c2\u6570\u6267\u884c aFunc\u51fd\u6570\u5e76\u5c06\u7ed3\u679c\u663e\u793a\u5728\u5f53\u524d\u4f4d\u7f6e\uff1b
5)\u00a0{$aFunc($var1, $var2)}\u00a0\u00a0–> \u643a\u5e26\u4e24\u4e2a\u4ee5\u4e0a\u53c2\u6570\u6267\u884c aFunc\u51fd\u6570\u5e76\u5c06\u7ed3\u679c\u663e\u793a\u5728\u5f53\u524d\u4f4d\u7f6e\uff1b
6)\u00a0{$var.substring(0, 10)}\u00a0 —> \u9488\u5bf9\u53d8\u91cf $var \u6267\u884cJavaScript\u539f\u751f\u7684\u5b57\u7b26\u4e32\u622a\u53d6\u51fd\u6570substring\uff0c\u5e76\u5c06\u7ed3\u679c\u663e\u793a\u5728\u5f53\u524d\u4f4d\u7f6e\uff1b
7) {$var=1} –> \u6b63\u5e38\u7684 JavaScript \u8d4b\u503c\u8bed\u53e5\uff0c\u4e0d\u4f1a\u5728\u5f53\u524d\u4f4d\u7f6e\u663e\u793a\u4efb\u4f55\u5185\u5bb9\uff1b
8) {$var++} –> \u6b63\u5e38\u7684 JavaScript \u5b57\u7b26\u4e32\u8fd0\u7b97\u64cd\u4f5c\uff0c\u4e0d\u4f1a\u5728\u5f53\u524d\u4f4d\u7f6e\u663e\u793a\u4efb\u4f55\u5185\u5bb9\uff1b
\u00a0\u00a0
\u7136\u800c\uff0c\u9488\u5bf9\u8868\u8fbe\u5f0f {$aFunc(0.2)} \u7684\u89e3\u6790\u8fc7\u7a0b\u4e2d\uff0c\u53d1\u9001\u4e86\u9519\u8bef\uff0c\u4e3b\u8981\u95ee\u9898\u662f\u5728\u533a\u5206 . dot \u548c , comma \u65f6\u53d1\u751f\u4e86\u5f02\u5e38\uff0c\u9700\u8981\u4fee\u590d\u3002<\/p>\n

2.2. \u89e3\u51b3\u601d\u8def\u65b9\u6cd5<\/strong><\/p>\n

\u5b9a\u4f4d\u5230\u95ee\u9898\u7684\u539f\u56e0\u662f\u7531\u4e8e\u00a0\u00a0. dot \u548c , comma \u7684\u4f4d\u7f6e\u95ee\u9898\uff0c\u5728\u7a0b\u5e8f\u4e2d\u9488\u5bf9\u8be5\u573a\u666f\u4e0b\u589e\u52a0\u517c\u5bb9\u5373\u53ef\uff0c\u6d89\u53ca\u5230\u7684\u6539\u52a8\u4e5f\u4e0d\u7b97\u5927\uff0c\u4e3b\u8981\u662f\u5728\u5c40\u90e8\u589e\u52a0\u4e86\u53d8\u91cf bracketPos \u548c dotPos\u3002\u5224\u65ad\u7684\u60c5\u51b5\u5305\u62ec\uff0c\u5f53 dotPos \u5c0f\u4e8e bracketPos \u65f6\uff0c\u662f\u901a\u5e38\u60c5\u51b5\u4e0b\u7684 6) \u7684\u8868\u8fbe\u5f0f\uff0c \u5f53 dotPos \u5927\u4e8e bracketPos \u65f6\uff0c\u5c31\u662f\u8981\u8868\u8fbe\u7684 1) \u5f0f\u3002<\/p>\n

2.3. \u6837\u4f8b<\/strong><\/p>\n

\u4fee\u6539\u524d:
…
{$aFunc(0.5)} –> \u89e3\u6790\u9519\u8bef\uff0c\u7a0b\u5e8f\u629b\u51fa\u5f02\u5e38<\/p>\n

\u4fee\u6539\u540e\uff1a
…
{$aFunc($abc)} –> aFunc($abc)
{$aFunc(0.5)} –> aFunc(0.5)\u00a0 \uff0c\u643a\u5e26\u53c2\u6570 0.5 \u6267\u884c\u51fd\u6570 aFunc \u5e76\u5c06\u7ed3\u679c\u663e\u793a\u5728\u5f53\u524d\u4f4d\u7f6e
{$a.substring(0, 5)} –> $a.substring(0,5)
…<\/p>\n

3. \u5176\u4ed6\u4e00\u4e9b\u6539\u8fdb\u4f18\u5316<\/strong><\/p>\n

3.1.\u00a0 \u91cd\u65b0\u542f\u7528 Hanjst.asyncScriptArr\u3002
3.2. \u6539\u8fdb appendScript\u3002
3.3. \u6539\u8fdb\u4e86\u5f02\u6b65\u8c03\u7528\u5bfc\u5165\u811a\u672c\u7a0b\u5e8f\u7684\u65f6\u5e8f\u3002
3.4. \u540c\u6b65\u66f4\u65b0\u4e86 Hanjst\u7684\u5728\u7ebf\u6587\u6863\u624b\u518c(\u00a0https:\/\/wadelau.github.io\/hanjst\/index<\/a>\u00a0)\uff0c+showImageAsync \u81ea\u5b9a\u4e49\u51fd\u6570\u7ae0\u8282.<\/p>\n

….<\/p>\n

\n

<\/p>\n

\ud83d\ude4b<\/span>Hanjst\u6c49\u5409\u65af\u7279 \u662f\u4e00\u79cd\u57fa\u4e8eJavaScript\u7684\u6a21\u677f\u8bed\u8a00\u53ca\u89e3\u6790\u5f15\u64ce\uff0c\u5979\u8fd0\u884c\u5728\u5ba2\u6237\u7aef\/\u670d\u52a1\u5668\u7aef\u3002<\/p>\n

\ud83d\ude4bHanjst\u6c49\u5409\u65af\u7279 \u80fd\u591f\u8868\u8ff0\u903b\u8f91\u63a7\u5236\uff0c\u80fd\u591f\u5b9e\u73b0\u4e0e\u670d\u52a1\u5668\u7aef\u6a21\u7248\u8bed\u8a00\u76f8\u540c\u7684\u529f\u80fd\u3002<\/p>\n