<html> <head> <title> JS千分位处理 </title> </head> <script> function $$(id){return document.getElementById(id);} /** * 数字格式转换成千分位 *@param{Object}num */ function commafy(num) { //1.先去除空格,判断是否空值和非数 num = num + ""; num = num.replace(/[ ]/g, ""); //去除空格 if (num == "") { return; } if (isNaN(num)){ return; } //2.针对是否有小数点，分情况处理 var index = num.indexOf("."); if (index==-1) {//无小数点 var reg = /(-?d+)(d{3})/; while (reg.test(num)) { num = num.replace(reg, "$1,$2"); } } else { var intPart = num.substring(0, index); var pointPart = num.substring(index + 1, num.length); var reg = /(-?d+)(d{3})/; while (reg.test(intPart)) { intPart = intPart.replace(reg, "$1,$2"); } num = intPart +"."+ pointPart; } return num; } /** * 去除千分位 *@param{Object}num */ function delcommafy(num){ num = num.replace(/[ ]/g, "");//去除空格 num=num.replace(/,/gi,''); return num; } function doit(val){ if(val.indexOf(",")>-1){ $$("tx").value=delcommafy(val); }else{ $$("tx").value=commafy(val); } } </script> <body> <input type="text" name="tx" id="tx" onclick="doit(this.value)" value="1234567" /> </body> </html>