The shortest, most flexible JavaScript date-to-string tool function I've ever seen

We know that JavaScript's date object does not provide a date format function, and converting a Date object to a "2015-7-02 20:35:11" format is a common requirement in the project. Recently in our project saw a piece of code, very short, here to share.

Date.prototype.format = function (format) {var o = {"m+": This.getmonth () + 1,//month "d+": this.getdate (),//day "H +": th Is.gethours (),//Hour "m+": this.getminutes (),//minute "s+": this.getseconds ()//second};    if (/(y+)/.test (format)) {format = Format.replace (regexp.$1, (this.getfullyear () + ""). substr (4-regexp.$1.length));} For (var k in O) {if (New RegExp ("(" + K + ")"). Test (format) {format = Format.replace (regexp.$1,    regexp.$1.length = = 1? O[k]: ("XX" + o[k]). substr (("" + o[k]). length);}} return format;};

This code supports regular expressions, so we have the flexibility to make date formatting strings:

var date = new Date (), Alert (Date.format ("Yyyy-mm--dd hh:mm:ss"));

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The shortest, most flexible JavaScript date-to-string tool function I've ever seen