Number.parseInt()

概述

Number.parseInt() 方法依据指定基数 [ 参数 radix 的值]，把字符串 [ 参数 string 的值] 解析成整数。

语法

Number.parseInt(string[, radix])

参数

string
The value to parse. If this argument is not a string, then it is converted to one using the ToString abstract operation. Leading whitespace in this argument is ignored.
radix
An integer between 2 and 36 that represents the radix (the base in mathematical numeral systems) of the string. Be careful — this does not default to 10.
The description below explains in more detail what happens when radix is not provided.
 

参数string：要解析的值。 如果此参数不是字符串，则使用ToString抽象操作将其转换为字符串。忽略此参数中的前导空格。
参数radix：一个介于2到36之间的整数，代表字符串的基数(数学数字系统中的基)。小心-这并不是默认为10。

返回值

An integer parsed from the given string. If the radix is smaller than 11, and the first non-whitespace character cannot be converted to a number, NaN is returned.

从给定字符串中解析的整数。如果基数小于11，且第一个非空白字符不能转换为数字，则返回NaN。

描述

这个方法和全局的 parseInt() 函数具有一样的函数功能:

Number.parseInt === parseInt; // true

ECMAScript 2015添加了这部分 (其目的是对全局变量进行模块化). 请另见 parseInt() 获取更多详情和示例.

Polyfill

if (Number.parseInt === undefined) {
    Number.parseInt = window.parseInt;
}

说明

说明 状态 评论
ECMAScript 2015 (6th Edition, ECMA-262)
Number.parseInt		 Standard 初始定义.
ECMAScript Latest Draft (ECMA-262)
Number.parseInt		 Draft

浏览器兼容性

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub
Desktop Mobile Server
Chrome Edge Firefox Internet Explorer Opera Safari Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet Node.js
parseInt Chrome Full support 34 Edge Full support 12 Firefox Full support 25 IE No support No Opera Full support 21 Safari Full support 9 WebView Android Full support ≤37 Chrome Android Full support 34 Firefox Android Full support 25 Opera Android Full support 21 Safari iOS Full support 9 Samsung Internet Android Full support 2.0 nodejs Full support 0.12

Legend

Full support  
Full support
No support  
No support

相关链接

  1. JavaScript 标准库
  2. Number
  3. 属性
    1. Number.EPSILON
    2. Number.MAX_SAFE_INTEGER
    3. Number.MAX_VALUE
    4. Number.MIN_SAFE_INTEGER
    5. Number.MIN_VALUE
    6. Number.NEGATIVE_INFINITY
    7. Number.NaN
    8. Number.POSITIVE_INFINITY
    9. Number.prototype
  4. 方法
    1. Number.isFinite()
    2. Number.isInteger()
    3. Number.isNaN()
    4. Number.isSafeInteger()
    5. Number.parseFloat()
    6. Number.parseInt()
    7. Number.prototype.toExponential()
    8. Number.prototype.toFixed()
    9. Number.prototype.toLocaleString()
    10. Number.prototype.toPrecision()
    11. Number.prototype.toSource()
    12. Number.prototype.toString()
    13. Number.prototype.valueOf()
    14. Number.toInteger()
  5. 继承
  6. Function
  7. 属性
    1. Function.arguments
    2. Function.arity
    3. Function.caller
    4. Function.displayName
    5. Function.length
    6. Function.name
    7. Function.prototype
  8. 方法
    1. Function.prototype.apply()
    2. Function.prototype.bind()
    3. Function.prototype.call()
    4. Function.prototype.isGenerator()
    5. Function.prototype.toSource()
    6. Function.prototype.toString()
  9. Object
  10. 属性
    1. Object.prototype.__count__
    2. Object.prototype.__noSuchMethod__
    3. Object.prototype.__parent__
    4. Object.prototype.__proto__
    5. Object.prototype.constructor
  11. 方法
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__lookupSetter__()
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toSource()
    10. Object.prototype.toString()
    11. Object.prototype.unwatch()
    12. Object.prototype.valueOf()
    13. Object.prototype.watch()
    14. Object.setPrototypeOf()