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<!DOCTYPE html> <html> <head> <style> #myDIV { border: 1px solid black; } </style> </head> <body> <div id="myDIV"> <p>我是 div 中的一个 p 元素，我内部有一个 <span id="mySPAN"><b>span</b></span> 元素。</p> </div> <p>点击按钮查看div元素是否包含span元素。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var span = document.getElementById("mySPAN"); var div = document.getElementById("myDIV").contains(span); document.getElementById("demo").innerHTML = div; } </script> </body> </html>