App下載
實例代碼( Tip: 登錄后體驗更佳 )
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</title>
</head>
<body>
<div id="myDIV">
  <h2 class="example">div 中 class="example" 的标题</h2>
  <p class="example">div 中 class="example" 的段落。</p> 
</div>
<p>点击按钮修改过 div 中的第一个 class="example" 的 p 元素。</p>
<button onclick="myFunction()">点我</button>
<script>
function myFunction() {
    var x = document.getElementById("myDIV");
    x.querySelector("p.example").innerHTML = "Hello World!";
}
</script>
</body>
</html>
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運行結果