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调试JavaScript中正则表达式中遇到的问题_javascript技巧

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Release： 2016-05-16 16:17:40
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关于正则表达式中字符串测试分问题，我们一般有test()和exec()两种方法，关于这两种方法的区别我这里就不加详细阐述了，主要就是test()返回布尔值，exec()返回匹配到的字符数组，但是今天我遇到一个问题， 程序非常简单，但是里面的问题让我很想不通，在网上找答案也没有找到(个人比较菜)。

复制代码 代码如下:

var pattern=new RegExp("match","ig");
alert(pattern.test("Match"));
alert(pattern.exec("Match"));

　　第一个alert()的值在预料之中为true

但是第二个测试值却出人意料的为null

关于这个问题我不知道是什么原理，因为我没看到函数源码，如果有朋友能够指出感激不尽！！

Related labels：
javascript regular expression
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