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js脚本function:
 //js数字千分符处理
        function commafy(num) {
              num = num + "";
              var re = /(-?\d+)(\d{3})/
              while (re.test(num)) {
                    num = num.replace(re, "$1,$2")
              }
              return num;
        }  
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原文地址:http://www.cnblogs.com/GerryOfZhong/p/5219614.html