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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<script type="text/javascript">
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Array.prototype.indexOf = function (vItem) {
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  for (var i=0; i < this.length; i++) {
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    if (vItem == this[i]) {
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      return i;
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    }
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  }
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  return -1;
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}
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var aColors = new Array("red", "green", "blue");
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document.write(aColors.indexOf("green"));
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</script>
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</body>
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</html>
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