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>