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Javascript没有任何内建的格式化函数，这里我们通过Google收集了5个javascript的数字格式化函数，希望对于大家的web开发能够带来方便。

十进制四舍五入

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这两段代码帮助你做到四舍五入，对于你显示价格或者订单比较有用：

代码1：

function CurrencyFormatted(amount) {
??? var i = parseFloat(amount);
??? if(isNaN(i)) { i = 0.00; }
??? var minus = '';
??? if(i < 0) { minus = '-'; }
??? i = Math.abs(i);
??? i = parseInt((i + .005) * 100);
??? i = i / 100;
??? s = new String(i);
??? if(s.indexOf('.') < 0) { s += '.00'; }
??? if(s.indexOf('.') == (s.length - 2)) { s += '0'; }
??? s = minus + s;
??? return s;
}
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/**
*?? Usage:? CurrencyFormatted(12345.678);
*?? result: 12345.68
**/

代码2：

function format_number(pnumber,decimals){
??? if (isNaN(pnumber)) { return 0};
??? if (pnumber=='') { return 0};
??? ?
??? var snum = new String(pnumber);
??? var sec = snum.split('.');
??? var whole = parseFloat(sec[0]);
??? var result = '';
??? ?
??? if(sec.length > 1){
??????? var dec = new String(sec[1]);
??????? dec = String(parseFloat(sec[1])/Math.pow(10,(dec.length - decimals)));
??????? dec = String(whole + Math.round(parseFloat(dec))/Math.pow(10,decimals));
??????? var dot = dec.indexOf('.');
??????? if(dot == -1){
??????????? dec += '.';
??????????? dot = dec.indexOf('.');
??????? }
??????? while(dec.length <= dot + decimals) { dec += '0'; }
??????? result = dec;
??? } else{
??????? var dot;
??????? var dec = new String(whole);
??????? dec += '.';
??????? dot = dec.indexOf('.');?? ?
??????? while(dec.length <= dot + decimals) { dec += '0'; }
??????? result = dec;
??? } ?
??? return result;
}
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/**
*?? Usage:? format_number(12345.678, 2);
*?? result: 12345.68
**/

添加逗号

这俩段代码帮助你添加逗号到每三位数字中，这让大的数字比较容易查看。

代码1： 
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function CommaFormatted(amount) {
??? var delimiter = ","; // replace comma if desired
??? amount = new String(amount);
??? var a = amount.split('.',2)
??? var d = a[1];
??? var i = parseInt(a[0]);
??? if(isNaN(i)) { return ''; }
??? var minus = '';
??? if(i < 0) { minus = '-'; }
??? i = Math.abs(i);
??? var n = new String(i);
??? var a = [];
??? while(n.length > 3)
??? {
??????? var nn = n.substr(n.length-3);
??????? a.unshift(nn);
??????? n = n.substr(0,n.length-3);
??? }
??? if(n.length > 0) { a.unshift(n); }
??? n = a.join(delimiter);
??? if(d.length < 1) { amount = n; }
??? else { amount = n + '.' + d; }
??? amount = minus + amount;
??? return amount;
}
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/**
*?? Usage:? CommaFormatted(12345678);
*?? result: 12,345,678
**/

代码2：

function addCommas(nStr) {
??? nStr += '';
??? var x = nStr.split('.');
??? var x1 = x[0];
??? var x2 = x.length >; 1 ?