關(guān)于JavaScript的Date最詳細(xì)解讀

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';
 };

 }() );
}

var obj = Object.create(null);
obj + 1; // Uncaught TypeError: Cannot convert object to primitive value(…)

new Date().toJSON() // "2016-05-05T06:03:28.130Z"

JSON.stringify(new Date()) // ""2016-05-05T06:06:02.615Z""

JSON.parse(JSON.stringify(new Date())) // "2016-05-05T06:19:24.766Z"
JSON.parse('"' + new Date().toJSON() + '"') // "2016-05-05T06:19:24.766Z"

var date = new Date(Date.UTC(2012, 11, 20, 3, 0, 0));

// formats below assume the local time zone of the locale;
// America/Los_Angeles for the US

// US English uses month-day-year order
alert(date.toLocaleString("en-US"));
// → "12/19/2012, 7:00:00 PM"

// British English uses day-month-year order
alert(date.toLocaleString("en-GB"));
// → "20/12/2012 03:00:00"

// Korean uses year-month-day order
alert(date.toLocaleString("ko-KR"));
// → "2012. 12. 20. ?? 12:00:00"

// Arabic in most Arabic speaking countries uses real Arabic digits
alert(date.toLocaleString("ar-EG"));
// → "???/???/???? ?:??:?? ?"

// for Japanese, applications may want to use the Japanese calendar,
// where 2012 was the year 24 of the Heisei era
alert(date.toLocaleString("ja-JP-u-ca-japanese"));
// → "24/12/20 12:00:00"

// when requesting a language that may not be supported, such as
// Balinese, include a fallback language, in this case Indonesian
alert(date.toLocaleString(["ban", "id"]));
// → "20/12/2012 11.00.00"

var date = new Date(Date.UTC(2012, 11, 20, 3, 0, 0));

date.toLocaleString("en-US", {hour12: false}); // "12/19/2012, 19:00:00"

var options = {timeZoneName:'long',weekday: "long", year: "2-digit", month: "narrow", day: "numeric"};
date.toLocaleString("en-US", options); // "Thursday, D 20, 12, China Standard Time"

let date = new Date();
let result = [
 [
 date.getFullYear(),
 date.getMonth() + 1,
 date.getDate()
 ].join('-'),
 [
 date.getHours(),
 date.getMinutes(),
 date.getSeconds()
 ].join(':')
].join(' ').replace(/\b\d\b/g, '0$&');

var date = new Date();
var result = date.toLocaleString('zh-CN', { hour12: false })
 .replace(/\//g, '-').replace(/\b\d\b/g, '0$&');