JS对时间的操作

 String.prototype.padingStar=function(totalLength,padingStr="") { ???????????if (totalLength <= this.length) { ???????????????return this; ???????????} ???????????var padLength = totalLength - this.length; ???????????if (padLength <= padingStr.length) { ???????????????return padingStr.substring(0, padLength) + this; ???????????} else { ???????????????var len = padLength / padingStr.length, n = 1,str=‘‘; ???????????????while (n<len) { ???????????????????str += padingStr; ???????????????????n++; ???????????????} ???????????????return str + padingStr.substring(0, padLength - (n-1) * padingStr.length) +this; ???????????} ???????} ???????String.prototype.padingEnd = function (totalLength, padingStr="") { ???????????//在开始的补全后面 ???????????if (totalLength <= this.length) { ???????????????return this; ???????????} ???????????var padLength = totalLength - this.length; ???????????if (padLength <= padingStr.length) { ???????????????return padingStr.substring(0, padLength) + this; ???????????} else { ???????????????var len = padLength / padingStr.length, n = 0,str=‘‘; ???????????????while (n<len) { ???????????????????str += padingStr; ???????????????????n++; ???????????????} ???????????????return this + padingStr.substring(0, padLength - (n - 1) * padingStr.length)+str; ???????????} ???????} ???????//获取当前月的开始 ???????Date.prototype.starOfMonth=function() { ???????????return new Date(this.getFullYear(), this.getMonth(), 1, 00, 00, 00); ???????} ???????//获取当前月的结束 ???????Date.prototype.endOfMonth=function() { ???????????return new Date(this.getFullYear(), this.getMonth() + 1, 0, 23, 59, 59); ???????} ???????//获取当前季度的开始时间 ???????Date.prototype.starofQuarter=function() { ???????????return new Date(this.getFullYear(), (this.getQuarter() - 1) * 3, 01, 00, 00, 00); ???????} ???????//获取当前季度的结束时间 ???????Date.prototype.endofQuarter=function() { ???????????return new Date(this.getFullYear(), this.getQuarter() * 3-1 , 31, 23, 59, 59); ???????} ???????//获取当前时间对应的季度 ???????Date.prototype.getQuarter=function() { ???????????return Math.ceil((this.getMonth() + 1) / 3); ???????} ???????//获取当前时间对应的年的开始 ???????Date.prototype.starOfYear=function() { ???????????return new Date(this.getFullYear(), 01, 01, 00, 00, 00); ???????} ????????//获取当前时间对应年的结束 ???????Date.prototype.endOfYear=function() { ???????????return new Date(this.getFullYear(), 12, 31, 23, 59, 59); ???????} ???????//把时间格式化为字符串 ???????Date.prototype.toDateString = function(format) { ???????????if (typeof (format) == "undefined") { ???????????????return this.toString(); ???????????} ???????????//可能我的第一个想法，就是 ???????????if (/y{4}/.test(format)) { ???????????????format = format.replace(/yyyy/g, this.getFullYear()); ???????????} ???????????if (/y{2}/.test(format)) { ???????????????format = format.replace(/y{2}/g,this.getFullYear().toString().substr(2)); ???????????} ???????????if (/M{2}/.test(format)) { ???????????????format = format.replace(/MM/,this.getMonth().toString().padingStar(2,0)); ???????????} ???????????if (/dd/.test(format)) { ???????????????format = format.replace(/dd/,this.getDate().toString().padingStar(2,‘0‘)); ???????????} ???????????if (/HH/.test(format)) { ???????????????format = format.replace(/HH/g, this.getHours().toString().padingStar(2, ‘0‘)); ???????????} ???????????if (/hh/.test(format)) { ???????????????format = format.replace(/hh/g, (hour < 12 ? hour : hour - 12).toString().padingStar(2, ‘0‘)); ???????????} ???????????if (/mm/.test(format)) { ???????????????format = format.replace(/mm/g, this.getMinutes().toString().padStart(2, ‘0‘)); ???????????} ???????????if (/ss/.test(format)) { ???????????????format = format.replace(/ss/g, this.getSeconds().toString().padStart(2, ‘0‘)); ???????????} ???????????return format; ???????} ???????????????//获取两个时间相隔的天数 ???????Date.prototype.betweenDays=function(date) { ???????????var daySpan = (Date.parse(this) - Date.parse(date)) / 86400000; ???????????return daySpan; ???????}