| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | if (!Date.prototype.format){ Object.defineProperty(Date.prototype, "format", { value: Date.prototype.format = function (fmt) { var week = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday']; var weekShortName = ['Sun', 'Mon', 'Tues', 'Wed', 'Thurs', 'Fri', 'Sat']; var month = ["December", "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November"] var monthShortName = ["Dec", "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov"]; var regs = { '%y': this.getFullYear() % 100,//两位数的年份表示（00-99）'%Y': this.getFullYear(),//四位数的年份表示（000-9999）'%m': this.getMonth() + 1,//月份（01-12）'%d': this.getDate(),//月内中的一天（0-31）'%H': this.getHours(),//24小时制小时数（0-23）'%I': this.getHours() % 12 + 1,//12小时制小时数（01-12）'%M': this.getMinutes(),//分钟数（00=59）'%S': this.getSeconds(),//秒（00-59）'%a': weekShortName[this.getDay()],//本地简化星期名称'%A': week[this.getDay()],//本地完整星期名称'%b': monthShortName[this.getMonth()],//本地简化的月份名称'%B': month[this.getMonth()],//本地完整的月份名称'%c': this.toLocaleString(),//本地相应的日期表示和时间表示'%j': getDayNumber(),//年内的第几天（001-366）'%u': Math.ceil(getDayNumber() / 7),//一年中的星期数（00-53）星期一为星期的开始'%U': this.getDay() == 0 ? parseInt(getDayNumber() / 7) + 1 : parseInt(getDayNumber() / 7),//一年中的星期数（00-53）星期日为星期的开始'%w': this.getDay(),//星期（0-6），星期日为星期的开始"%q": Math.ceil((this.getMonth() + 1) / 3), //季度'%x': this.toLocaleDateString(),//本地相应的日期表示'%X': this.toLocaleTimeString(),//本地相应的时间表示}; //格式化匹配for (var k in regs) { if (new RegExp("(" + k + ")").test(fmt)) { fmt = fmt.replace(RegExp.$1, regs[k]); } } return fmt; }, configurable: true, enumerable: false, writable: true}); } | | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

本文摘自： https://juejin.im/entry/59edb91ff265da43163c3bf5?utm_source=gold_browser_extension