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编辑您的代码：
<!DOCTYPE html> <html> <body> <p>Hello World!</p> <p>DOM 很有用！</p> <p>本例演示 <b>length</b> 属性。</p> <script> x=document.getElementsByTagName("p"); for (i=0;i<x.length;i++) { document.write(x[i].innerHTML); document.write("<br>"); } </script> </body> </html>
查看结果: