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Tryit: JAVASCRIPT
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<!DOCTYPE html> <html> <body> <h1>HTMLCollection 对象</h1> <p>遍历此页面上的每个 HTML 元素，并写入其标签名称：</p> <script> var x, i, l; x = document.getElementsByTagName("*"); l = x.length; for (i = 0; i < l; i++) { document.write(x[i].tagName + "<br>"); } </script> </body> </html>