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外联js在css前面
- <!DOCTYPE html>
<html>
<head>
<title>test</title>
<script src="H5FullscreenPage.js" type ="text/javascript" ></script >
<link rel="stylesheet" type="text/css" href="stylesheet.css" media="screen">
<link rel="stylesheet" type="text/css" href="page-animation.css" media="screen">
</head>
<body>
<img src="download-button.png" alt="HTML代码优化 网页性能 JavaScript技巧 Javascript">
</body>
</html>
1 没有阻止css的并行加载但是影响了body里面img的并行加载
外联js在css中间
- <!DOCTYPE html>
<html>
<head>
<title>test</title>
<link rel="stylesheet" type="text/css" href="stylesheet.css" media="screen">
<script src="H5FullscreenPage.js" type ="text/javascript" ></script >
<link rel="stylesheet" type="text/css" href="page-animation.css" media="screen">
</head>
<body>
<img src="download-button.png" alt="HTML代码优化 网页性能 JavaScript技巧 Javascript">
</body>
</html>
1 影响了css的并行加载和body里面img的并行加载
外联js在css最后
- <!DOCTYPE html>
<html>
<head>
<title>test</title>
<link rel="stylesheet" type="text/css" href="stylesheet.css" media="screen">
<link rel="stylesheet" type="text/css" href="page-animation.css" media="screen">
<script src="H5FullscreenPage.js" type ="text/javascript" ></script >
</head>
<body>
<img src="download-button.png" alt="HTML代码优化 网页性能 JavaScript技巧 Javascript">
</body>
</html>
1 影响了css的并行加载和body里面img的并行加载
内嵌js在css前面
- <!DOCTYPE html>
<html>
<head>
<title>test</title>
<script type ="text/javascript" >
var f = 1;
f++;
</script >
<link rel="stylesheet" type="text/css" href="stylesheet.css" media="screen">
<link rel="stylesheet" type="text/css" href="page-animation.css" media="screen">
</head>
<body>
<img src="download-button.png" alt="HTML代码优化 网页性能 JavaScript技巧 Javascript">
</body>
</html>
1 没有影响css的并行加载也没有影响body里面img的并行加载
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