function formatCurrency(num) {var sign="";if(isNaN(num)){num = 0;}if(num<0){sign="-";}var strNum=num+"";var arr1 = strNum.split(".");var hasPoint=false;//是否有小数部分var piontPart="";//小数部分var intPart=strNum;//整数部分if(arr1.length>=2){hasPoint=true;piontPart= arr1[1];intPart=arr1[0];}var res='';//保存添加逗号的部分var intPartlength=intPart.length;//整数部分长度var maxcount=Math.ceil(intPartlength/3);//整数部分需要添加几个逗号for (var i = 1; i <=maxcount;i++)//每三位添加一个逗号{var startIndex=intPartlength-i*3;//开始位置if(startIndex<0)//开始位置小于0时修正为0{startIndex=0;}http://www.unitymanual.com  unity3dvar endIndex=intPartlength-i*3+3;//结束位置var part=intPart.substring(startIndex,endIndex)+",";res=part+res;}res=res.substr(0,res.length-1);//去掉最后一个逗号if(hasPoint){return "￥"+sign+res+"."+piontPart;}else{return "￥"+sign+res;}}