<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
</head>
<body>
<h2>JavaScript HTML DOM</h2>
<p>Hello World!</p>
<p>Hello Runoob!</p>
<p id="demo"></p>
<script>
var myCollection = document.getElementsByTagName("p");
document.getElementById("demo").innerHTML = "第二个段落的内容为:<span style=‘color:red;‘> " + myCollection[1].innerHTML + ‘</span>‘;
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
</head>
<body>
<h2>JavaScript HTML DOM</h2>
<p>Hello World!</p>
<p>Hello Runoob!</p>
<p id="demo"></p>
<script>
var myCollection = document.getElementsByTagName("p");
document.getElementById("demo").innerHTML = "文档包含" + myCollection.length + " 个段落。";
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
</head>
<body>
<h2>JavaScript HTML DOM</h2>
<p>Hello World!</p>
<p>Hello Runoob!</p>
<p>点击按钮修改 p 元素的背景颜色。</p>
<button onclick="myFunction()">点我</button>
<script>
function myFunction() {
var myCollection = document.getElementsByTagName("p");
var i;
for (i = 0; i < myCollection.length; i++) {
myCollection[i].style.color = "red";
}
}
</script>
</body>
</html>
原文地址：https://www.cnblogs.com/tszr/p/10944353.html
时间： 2024-11-05 22:42:26