案例：javascript案例     状态：可编辑再运行    进入竖版
 运行结果　
​x
 
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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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var str = "The rain in Spain stays mainly in the plain";
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var patt1 = new RegExp("ain", "g");
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​
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for(i = 0; i < 4; i++)
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  {
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  patt1.test(str)
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  document.write("ain found. index now at: " + patt1.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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​