怎样把整型数据转换成字符型数据

怎样把整型数据转换成字符型数据
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var s="123m";
var im=parseIni(s);//return 123
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var v;
v=123;
v=String(v);
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1<script>   
2var v=123   
3alert(typeof(v.toString()))   
4</script>

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var s=123;
s = s + "";
alert(typeof(s))