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5个javascript的数字格式化函数分享

　　本文标签：数字,格式化函数

十进制四舍五入
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：
复制代码 代码如下:

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;
}
/**
* Usage: CurrencyFormatted(12345.678);
* result: 12345.68
**/

代码2：
复制代码 代码如下:

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;
}
/**
* 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：
复制代码 代码如下:

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;
}
/**
* Usage: CommaFormatted(12345678);
* result: 12,345,678
**/

代码2：
复制代码 代码如下:

function addCommas(nStr) {
nStr += ;
var x = nStr.split(.);
var x1 = x[0];
var x2 = x.length >; 1 ? . + x[1] : ;
var rgx = /(d+)(d{3})/;
while (rgx.test(x1)) {
x1 = x1.replace(rgx, $1 + , + $2);
}
return x1 + x2;
}
/**
* Usage: addCommas(12345678);
* result: 12,345,678
**/

数字格式化，来自PHP
这段javascript代码功能设计来自PHP的nubmer_format功能 。能够四舍五入并且加入逗号分隔 。而且可以自定义10进制分隔 。
复制代码 代码如下:

function number_format (number, decimals, dec_point, thousands_sep) {
number = (number + ).replace(/[^0-9+-Ee.]/g, );
var n = !isFinite(+number) ? 0 : +number,
prec = !isFinite(+decimals) ? 0 : Math.abs(decimals),
sep = (typeof thousands_sep === undefined) ? , : thousands_sep,
dec = (typeof dec_point === undefined) ? . : dec_point,
s = ,
toFixedFix = function (n, prec) {
var k = Math.pow(10, prec);
return + Math.round(n * k) / k;
};
// Fix for IE parseFloat(0.55).toFixed(0) = 0;
s = (prec ? toFixedFix(n, prec) : + Math.round(n)).split(.);
if (s[0].length > 3) {
s[0] = s[0].replace(/B(?=(?:d{3})+(?!d))/g, sep);
}
if ((s[1] || ).length < prec) {
s[1] = s[1] || ;
s[1] += new Array(prec - s[1].length + 1).join(0);
}
return s.join(dec);
}
/**
* Usage: number_format(123456.789, 2, ., ,);
* result: 123,456.79
**/

添加一个英文的排序后缀
复制代码 代码如下:

Number.prototype.toOrdinal = function() {
var n = this % 100;
var suffix = [th, st, nd, rd, th];
var ord = n < 21 ? (n < 4 ? suffix[n] : suffix[0]) : (n % 10 > 4 ? suffix[0] : suffix[n % 10]);
return this + ord;
}
/*
* Usage:
* var myNumOld = 23
* var myNumNew = myNumOld.toOrdinal()
* Result: 23rd
*/

除去非数字的字符
复制代码 代码如下:

function stripNonNumeric( str )
{
str += ;
var rgx = /^d|.|-$/;
var out = ;
for( var i = 0; i < str.length; i++ )
{
if( rgx.test( str.charAt(i) ) ){
if( !( ( str.charAt(i) == . && out.indexOf( . ) != -1 ) ||
( str.charAt(i) == - && out.length != 0 ) ) ){
out += str.charAt(i);
}
}
}
return out;
}
/*
* Usage: stripNonNumeric(123et45dhs6.789);
* Result: 123456.789
*/