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源代码：
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<html><!DOCTYPE html> <html> <body> <p>Hello World!</p> <p>The DOM is very useful!</p> <p>This example demonstrates the <b>length</b> property.</p> <script> x=document.getElementsByTagName("p"); for (i=0;i<x.length;i++) { document.write(x[i].innerHTML); document.write("<br>"); } </script> </body> </html>
运行结果
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