案例：javascript案例     状态：可编辑再运行    进入竖版
 运行结果　
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<html>
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<body>
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​
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<script type="text/javascript">
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​
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var str = "Visit W3xue, W3xue is a place to study web technology.";
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var patt = new RegExp("W3xue","g");
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var result;
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​
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while ((result = patt.exec(str)) != null)  {
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  document.write(result);
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  document.write("<br />");
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  document.write(patt.lastIndex);
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  document.write("<br />");
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 }
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</script>
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​
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</body>
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</html>
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​