javaScript 应用-货币格式化函数
    html页面用起来很方便，格式化过的赋值给显示用的控件，还原后的数字赋值给一个隐藏控件即可。

 /** 货币格式化函数 **/
	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);
	}
	/** 还原货币格式化函数 **/
	function restoreFormatCurrency(num){
       	var num1=num.replace(',','').replace(/,/g,''); 
        return num1;
	}