JavaScript 将数值转换成金额形式

/**
 * 将数值四舍五入(保留2位小数)后格式化成金额形式
 *
 * @param num 数值(Number或者String)
 * @return 金额格式的字符串,如'1,234,567.45'
 * @type String
 * (num/100)可以改保留的位数
 */



<script type="text/javascript">    

 function formatCurrency(num) {
     num = num.toString().replace(/\$|\,/g,'');
       if(isNaN(num))
       num = "0";
       sign = (num == (num = Math.abs(num)));
       num = Math.floor(num*100+0.50000000001);
       cents = num%100;
       num = Math.floor(num/100).toString(); 
       if(cents<10)
       cents = "0" + cents;
       for (var i = 0; i < Math.floor((num.length-(1+i))/3); i++)
       num = num.substring(0,num.length-(4*i+3))+','+
       num.substring(num.length-(4*i+3));
       return (((sign)?'':'-') + num + '.' + cents);
}