javascript 如何截取字符串后两个字符的N种方法

<script>
string="abcdefg"
alert(string.substring(string.length-2,string.length))
</script>

<script>
alert("abcdefg".match(/.*(.{2})/)[1])
</script>

<script>
alert("abcdefg".match(/.{2}$/))
</script>

<script>
alert("abcdefg".slice(-2))
</script>

 

<script language="javascript">
 
      String.prototype.right = function(n) {
 
               return this.slice(this.length - n-1);
 
      }
 

      var s = 'abcdefg';
 
      window.alert(s.right(2));
 
</script>

 

 

http://hi.baidu.com/webnum/blog/item/a1833158983f033c2834f0b0.html

http://bbs.51js.com/thread-54383-1-1.html

 

在线测试工具：

http://www.w3school.com.cn/tiy/t.asp?f=jseg_slice_array