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<!DOCTYPE html> <html> <body> <h1>Element 对象</h1> <h2>children 属性</h2> <p>body 的子元素的标签名是：</p> <p id="demo"></p> <script> const collection = document.body.children; let text = ""; for (let i = 0; i < collection.length; i++) { text += collection[i].tagName + "<br>"; } document.getElementById("demo").innerHTML = text; </script> </body> </html>