Far*_*our 3 html javascript css
我试图让我的JavaScript在工作的时候插入脚本插入head或body元素.
这是我的例子:
首先,我将其插入到body像这个例子(工作):
<html>
<body>
<p id="p2">Hello World!</p>
<script>
document.getElementById("p2").style.color = "blue";
</script>
<p>The paragraph above was changed by a script.</p>
</body>
</html>当我移动script到body(也工作)的结束时:
<html>
<body>
<p id="p2">Hello World!</p>
<p>The paragraph above was changed by a script.</p>
<script>
document.getElementById("p2").style.color = "blue";
</script>
</body>
</html>但当我把它移动到head它停止工作时:
<html>
<head>
<script>
document.getElementById("p2").style.color = "blue";
</script>
</head>
<body>
<p id="p2">Hello World!</p>
<p>The paragraph above was changed by a script.</p>
</body>
</html>使用关键字延迟:
延迟说明:
直到页面加载后才会运行的脚本.
<html>
<body>
<p id="p2">Hello World!</p>
<script defer>
document.getElementById("p2").style.color = "blue";
</script>
<p>The paragraph above was changed by a script.</p>
</body>
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