JavaScript中的数字格式类似于C#
是否有一种简单的方法可以在JavaScript中格式化数字,类似于C#(或VB.NET)中通过JavaScript中的数字格式类似于C#,javascript,jquery,format,numbers,Javascript,Jquery,Format,Numbers,是否有一种简单的方法可以在JavaScript中格式化数字,类似于C#(或VB.NET)中通过ToString(“格式提供程序”)或String.format()?通常情况下的格式化方法 jQuery中的 (一个不错的数字格式化程序和输入助手,支持jQuery 1.5+) (Java和的客户端实现) 首先,在JS中将整数转换为字符串非常简单: // Start off with a number var number = 42; // Convert into a string by
ToString(“格式提供程序”)
或String.format()
?通常情况下的格式化方法
- (一个不错的数字格式化程序和输入助手,支持jQuery 1.5+)
- (Java和的客户端实现)
// Start off with a number
var number = 42;
// Convert into a string by appending an empty (or whatever you like as a string) to it
var string = 42+'';
// No extra conversion is needed, even though you could actually do
var alsoString = number.toString();
如果将数字作为字符串并希望将其转换为整数,则必须使用parseInt(string)
表示整数,使用parseFloat(string)
表示浮点数。然后,这两个函数都返回所需的整数/浮点。例如:
// Start off with a float as a string
var stringFloat = '3.14';
// And an int as a string
var stringInt = '42';
// typeof stringInt would give you 'string'
// Get the real float from the string
var realFloat = parseFloat(someFloat);
// Same for the int
var realInt = parseInt(stringInt);
// but typeof realInt will now give you 'number'
从你的问题来看,我还不清楚你到底想在etc后面加什么。这里有一个简单的JS函数,可以将逗号添加到字符串格式的整数中。它将处理整数或十进制数。您可以传递数字或字符串。它显然返回一个字符串
function addCommas(str) {
var parts = (str + "").split("."),
main = parts[0],
len = main.length,
output = "",
first = main.charAt(0),
i;
if (first === '-') {
main = main.slice(1);
len = main.length;
} else {
first = "";
}
i = len - 1;
while(i >= 0) {
output = main.charAt(i) + output;
if ((len - i) % 3 === 0 && i > 0) {
output = "," + output;
}
--i;
}
// put sign back
output = first + output;
// put decimal part back
if (parts.length > 1) {
output += "." + parts[1];
}
return output;
}
下面是一组测试用例:
您可以看到它在前面的JSFIDLE中使用。通过简单的谷歌搜索“javascript添加逗号”,您也可以找到处理十进制数的函数
将数字转换为字符串有多种方法。最简单的方法是将其添加到字符串中:
var myNumber = 3;
var myStr = "" + myNumber; // "3"
在JSFIDLE的上下文中,您可以通过更改以下行在计数器中输入逗号:
jTarget.text(current);
为此:
jTarget.text(addCommas(current));
您可以看到它在这里工作:是的,有一种方法可以在javascript中正确设置数字格式,例如:
var val=2489.8237
val.toFixed(3) //returns 2489.824 (round up)
val.toFixed(2) //returns 2489.82
val.toFixed(7) //returns 2489.8237000 (padding)
var flt = '5.99';
var nt = '6';
var rflt = parseFloat(flt);
var rnt = parseInt(nt);
使用variablename.toFixed
还有另一个函数toPrecision()
。
有关更多详细信息,您还可以访问
使用JQuery
$(document).ready(function()
{
//Only number and one dot
function onlyDecimal(element, decimals)
{
$(element).keypress(function(event)
{
num = $(this).val() ;
num = isNaN(num) || num === '' || num === null ? 0.00 : num ;
if ((event.which != 46 || $(this).val().indexOf('.') != -1) && (event.which < 48 || event.which > 57))
{
event.preventDefault();
}
if($(this).val() == parseFloat(num).toFixed(decimals))
{
event.preventDefault();
}
});
}
onlyDecimal("#TextBox1", 3) ;
});
$(文档).ready(函数()
{
//只有数字和一个点
仅函数小数(元素,小数)
{
$(元素)。按键(功能(事件)
{
num=$(this.val();
num=isNaN(num)| | num==''| | num===null?0.00:num;
if((event.which!=46 | | |$(this.val().indexOf('.')!=1)和&(event.which<48 | | event.which>57))
{
event.preventDefault();
}
if($(this.val()==parseFloat(num).toFixed(小数))
{
event.preventDefault();
}
});
}
仅限CIMAL(“文本框1”,3);
});
如果您不想使用jQuery,请查看以下示例:
var val=2489.8237
val.toFixed(3) //returns 2489.824 (round up)
val.toFixed(2) //returns 2489.82
val.toFixed(7) //returns 2489.8237000 (padding)
var flt = '5.99';
var nt = '6';
var rflt = parseFloat(flt);
var rnt = parseInt(nt);
:
- 简短、快速、灵活但独立。仅75行,包括MIT许可证信息、空行和注释
- 接受标准的数字格式,如#、##0.00或带否定-000
- 接受任何国家/地区格式,如####################或任何类型的非编号符号
- 接受任意数字分组。#,#,##0.000或#,#########0.均有效
- 接受任何冗余/防错格式。############或者0、00、0都可以
- 自动数字舍入
- 简单的界面,只需提供如下掩码和值:格式(“0.0000”,3.141592)
(666.0).toLocaleString()
numObj.toLocaleString([locales [, options]])
ECMA-262 5.1版中描述的:
并且将在未来版本的浏览器中工作…这里是另一个版本:
$.fn.digits = function () {
return this.each(function () {
var value = $(this).text();
var decimal = "";
if (value) {
var pos = value.indexOf(".");
if (pos >= 0) {
decimal = value.substring(pos);
value = value.substring(0, pos);
}
if (value) {
value = value.replace(/(\d)(?=(\d\d\d)+(?!\d))/g, "$1,");
if (!String.isNullOrEmpty(decimal)) value = (value + decimal);
$(this).text(value);
}
}
else {
value = $(this).val()
if (value) {
var pos = value.indexOf(".");
if (pos >= 0) {
decimal = value.substring(pos);
value = value.substring(0, pos);
}
if (value) {
value = value.replace(/(\d)(?=(\d\d\d)+(?!\d))/g, "$1,");
if (!String.isNullOrEmpty(decimal)) value = (value + decimal);
$(this).val(value);
}
}
}
})
};
要获得逗号后有2个数字的十进制数,可以使用:
function nformat(a) {
var b = parseInt(parseFloat(a)*100)/100;
return b.toFixed(2);
}
这里有一些解决方案,都通过了测试套件,包括测试套件和基准测试,如果您想复制并粘贴到测试中,请尝试 方法0(RegExp) 基于,但如果没有小数点则修复
if (typeof Number.prototype.format === 'undefined') {
Number.prototype.format = function (precision) {
if (!isFinite(this)) {
return this.toString();
}
var a = this.toFixed(precision).split('.');
a[0] = a[0].replace(/\d(?=(\d{3})+$)/g, '$&,');
return a.join('.');
}
}
方法1
方法3(循环)
例子
测试套件
基准
功能基准(f){
var start=new Date().getTime();
f();
返回新日期().getTime()-start;
}
函数基准\u格式(f){
控制台日志(f);
时间=基准(函数(){
对于(变量i=0;i<100000;i++){
f、 电话(123456789,0);
f、 电话(123456789,2);;
}
});
console.log(time.format(0)+“ms”);
}
异步=[];
函数next(){
setTimeout(函数(){
f=async.shift();
f&&f();
next();
}, 10);
}
console.log('==========Benchmark==========');
push(函数(){benchmark_格式(Number.prototype.format);});
push(函数(){benchmark_格式(Number.prototype.format1);});
push(函数(){benchmark_格式(Number.prototype.format2);});
push(函数(){benchmark_格式(Number.prototype.format3);});
next();
我编写了一个简单的函数(还不需要另一个jQuery插件!!),它可以将一个数字转换为十进制分隔字符串或空字符串(如果该数字不是以数字开头):
function format(x) {
return isNaN(x)?"":x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
}
格式(578999)代码>导致578999
格式(10)代码>导致10
如果希望使用小数点而不是逗号,只需将代码中的逗号替换为小数点即可
其中一条评论正确地指出,这只适用于整数,通过一些小的调整,您也可以使其适用于浮点:
function format(x) {
if(isNaN(x))return "";
n= x.toString().split('.');
return n[0].replace(/\B(?=(\d{3})+(?!\d))/g, ",")+(n.length>1?"."+n[1]:"");
}
我做了一个简单的函数,也许有人可以使用它
function secsToTime(secs){
function format(number){
if(number===0){
return '00';
}else {
if (number < 10) {
return '0' + number
} else{
return ''+number;
}
}
}
var minutes = Math.floor(secs/60)%60;
var hours = Math.floor(secs/(60*60))%24;
var days = Math.floor(secs/(60*60*24));
var seconds = Math.floor(secs)%60;
return (days>0? days+"d " : "")+format(hours)+':'+format(minutes)+':'+format(seconds);
}
函数秒时间(秒){
函数格式(数字){
如果(数字==0){
返回'00';
}否则{
如果(数字<10){
返回“0”+数字
}否则{
返回“”+数字;
}
}
}
var分钟=数学地板(秒/60)%60;
var小时=数学楼层(秒/(60*60))%24;
变量天数=数学下限(秒/(60*60*24));
var秒=数学地板(秒)%60;
返回(天>0?天+“d”:“”)+格式(小时)+':'+格式(分钟)+':'+格式(秒);
}
这可以产生以下输出:
- 5d 02:53:39
- 4d 22:15:16
function assertEqual(a, b) {
if (a !== b) {
throw a + ' !== ' + b;
}
}
function test(format_function) {
console.log(format_function);
assertEqual('NaN', format_function.call(NaN, 0))
assertEqual('Infinity', format_function.call(Infinity, 0))
assertEqual('-Infinity', format_function.call(-Infinity, 0))
assertEqual('0', format_function.call(0, 0))
assertEqual('0.00', format_function.call(0, 2))
assertEqual('1', format_function.call(1, 0))
assertEqual('-1', format_function.call(-1, 0))
// decimal padding
assertEqual('1.00', format_function.call(1, 2))
assertEqual('-1.00', format_function.call(-1, 2))
// decimal rounding
assertEqual('0.12', format_function.call(0.123456, 2))
assertEqual('0.1235', format_function.call(0.123456, 4))
assertEqual('-0.12', format_function.call(-0.123456, 2))
assertEqual('-0.1235', format_function.call(-0.123456, 4))
// thousands separator
assertEqual('1,234', format_function.call(1234.123456, 0))
assertEqual('12,345', format_function.call(12345.123456, 0))
assertEqual('123,456', format_function.call(123456.123456, 0))
assertEqual('1,234,567', format_function.call(1234567.123456, 0))
assertEqual('12,345,678', format_function.call(12345678.123456, 0))
assertEqual('123,456,789', format_function.call(123456789.123456, 0))
assertEqual('-1,234', format_function.call(-1234.123456, 0))
assertEqual('-12,345', format_function.call(-12345.123456, 0))
assertEqual('-123,456', format_function.call(-123456.123456, 0))
assertEqual('-1,234,567', format_function.call(-1234567.123456, 0))
assertEqual('-12,345,678', format_function.call(-12345678.123456, 0))
assertEqual('-123,456,789', format_function.call(-123456789.123456, 0))
// thousands separator and decimal
assertEqual('1,234.12', format_function.call(1234.123456, 2))
assertEqual('12,345.12', format_function.call(12345.123456, 2))
assertEqual('123,456.12', format_function.call(123456.123456, 2))
assertEqual('1,234,567.12', format_function.call(1234567.123456, 2))
assertEqual('12,345,678.12', format_function.call(12345678.123456, 2))
assertEqual('123,456,789.12', format_function.call(123456789.123456, 2))
assertEqual('-1,234.12', format_function.call(-1234.123456, 2))
assertEqual('-12,345.12', format_function.call(-12345.123456, 2))
assertEqual('-123,456.12', format_function.call(-123456.123456, 2))
assertEqual('-1,234,567.12', format_function.call(-1234567.123456, 2))
assertEqual('-12,345,678.12', format_function.call(-12345678.123456, 2))
assertEqual('-123,456,789.12', format_function.call(-123456789.123456, 2))
}
console.log('======== Testing ========');
test(Number.prototype.format);
test(Number.prototype.format1);
test(Number.prototype.format2);
test(Number.prototype.format3);
function benchmark(f) {
var start = new Date().getTime();
f();
return new Date().getTime() - start;
}
function benchmark_format(f) {
console.log(f);
time = benchmark(function () {
for (var i = 0; i < 100000; i++) {
f.call(123456789, 0);
f.call(123456789, 2);
}
});
console.log(time.format(0) + 'ms');
}
async = [];
function next() {
setTimeout(function () {
f = async.shift();
f && f();
next();
}, 10);
}
console.log('======== Benchmark ========');
async.push(function () { benchmark_format(Number.prototype.format); });
async.push(function () { benchmark_format(Number.prototype.format1); });
async.push(function () { benchmark_format(Number.prototype.format2); });
async.push(function () { benchmark_format(Number.prototype.format3); });
next();
function format(x) {
return isNaN(x)?"":x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
}
function format(x) {
if(isNaN(x))return "";
n= x.toString().split('.');
return n[0].replace(/\B(?=(\d{3})+(?!\d))/g, ",")+(n.length>1?"."+n[1]:"");
}
function secsToTime(secs){
function format(number){
if(number===0){
return '00';
}else {
if (number < 10) {
return '0' + number
} else{
return ''+number;
}
}
}
var minutes = Math.floor(secs/60)%60;
var hours = Math.floor(secs/(60*60))%24;
var days = Math.floor(secs/(60*60*24));
var seconds = Math.floor(secs)%60;
return (days>0? days+"d " : "")+format(hours)+':'+format(minutes)+':'+format(seconds);
}
function numberFormat( number ){
var digitCount = (number+"").length;
var formatedNumber = number+"";
var ind = digitCount%3 || 3;
var temparr = formatedNumber.split('');
if( digitCount > 3 && digitCount <= 6 ){
temparr.splice(ind,0,',');
formatedNumber = temparr.join('');
}else if (digitCount >= 7 && digitCount <= 15) {
var temparr2 = temparr.slice(0, ind);
temparr2.push(',');
temparr2.push(temparr[ind]);
temparr2.push(temparr[ind + 1]);
// temparr2.push( temparr[ind + 2] );
if (digitCount >= 7 && digitCount <= 9) {
temparr2.push(" million");
} else if (digitCount >= 10 && digitCount <= 12) {
temparr2.push(" billion");
} else if (digitCount >= 13 && digitCount <= 15) {
temparr2.push(" trillion");
}
formatedNumber = temparr2.join('');
}
return formatedNumber;
}
function format(number, decimals = 2, decimalSeparator = '.', thousandsSeparator = ',') {
const roundedNumber = number.toFixed(decimals);
let integerPart = '', fractionalPart = '';
if (decimals == 0) {
integerPart = roundedNumber;
decimalSeparator = '';
} else {
let numberParts = roundedNumber.split('.');
integerPart = numberParts[0];
fractionalPart = numberParts[1];
}
integerPart = integerPart.replace(/(\d)(?=(\d{3})+(?!\d))/g, `$1${thousandsSeparator}`);
return `${integerPart}${decimalSeparator}${fractionalPart}`;
}
let min = 1556454.0001;
let max = 15556982.9999;
console.time('number format');
for (let i = 0; i < 15000; i++) {
let randomNumber = Math.random() * (max - min) + min;
let formated = format(randomNumber, 4, ',', '.'); // formated number
console.debug('number: ', randomNumber, 'formated: ', formated);
}
console.timeEnd('number format');