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Date.prototype.toISOString()

概述

toISOString() 方法返回一个 ISO(ISO 8601 Extended Format)格式的字符串: YYYY-MM-DDTHH:mm:ss.sssZ。时区总是UTC(协调世界时),加一个后缀“Z”标识。

语法

dateObj.toISOString()

例子

var today = new Date("05 October 2011 14:48 UTC");
alert(today.toISOString()); // 返回2011-10-05T14:48:00.000Z

上例使用了非标准字符串的解析,该字符串在某些旧的浏览器(如IE)中可能无法被正确解析。

Polyfill

该方法在ECMA-262第5版中被标准化。对于那些不支持此方法的JS引擎可以通过加上下面的代码实现:

if ( !Date.prototype.toISOString ) {
  ( function() {
    
    function pad(number) {
      if ( number < 10 ) {
        return '0' + number;
      }
      return number;
    }
 
    Date.prototype.toISOString = function() {
      return this.getUTCFullYear() +
        '-' + pad( this.getUTCMonth() + 1 ) +
        '-' + pad( this.getUTCDate() ) +
        'T' + pad( this.getUTCHours() ) +
        ':' + pad( this.getUTCMinutes() ) +
        ':' + pad( this.getUTCSeconds() ) +
        '.' + (this.getUTCMilliseconds() / 1000).toFixed(3).slice(2, 5) +
        'Z';
    };
  
  }() );
}

规范

规范版本 规范状态 注解
ECMAScript 5.1 (ECMA-262)
Date.prototype.toISOString

Implemented in JavaScript 1.8
Standard Initial definition.
ECMAScript 6 (ECMA-262)
Date.prototype.toISOString
Release Candidate  

浏览器兼容性

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) (Yes) 9 (Yes) (Yes)
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)

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