//时间格式化
Date.prototype.format = function(fmt) {
var o = {
"M+": this.getMonth() + 1, //月份
"d+": this.getDate(), //日
"h+": this.getHours(), //小时
"m+": this.getMinutes(), //分
"s+": this.getSeconds(), //秒
"q+": Math.floor((this.getMonth() + 3) / 3), //季度
"S": this.getMilliseconds() //毫秒
};
if(/(y+)/.test(fmt)) {
fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
}
for(var k in o) {
if(new RegExp("(" + k + ")").test(fmt)) {
fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
}
}
return fmt;
}
//得到某天的前天，后天
Date.prototype.getCountDate = function(num) {
return new Date(this.setDate(this.getDate()+num)).format('yyyy-MM-dd');
}
//某月最后一天
Date.prototype.getMonthEnd = function() {
return new Date(this.getFullYear(),this.getMonth()+1).toJSON().substring(0,10);
}
//某月多少天
Date.prototype.getMonthEnd = function() {
var curMonth = this.getMonth();
this.setMonth(curMonth + 1);
this.setDate(0);
return this.getDate();
}
//某日是某年的第几周
Date.prototype.getTheWeek = function() {
var totalDays = 0, now=this;
var years = now.getFullYear()
if (years < 1000)
years += 1900
var days = new Array(12);
days[0] = 31;
days[2] = 31;
days[3] = 30;
days[4] = 31;
days[5] = 30;
days[6] = 31;
days[7] = 31;
days[8] = 30;
days[9] = 31;
days[10] = 30;
days[11] = 31;
//判断是否为闰年，针对2月的天数进行计算
if (Math.round(now.getYear() / 4) == now.getYear() / 4) {
days[1] = 29
} else {
days[1] = 28
}
if (now.getMonth() == 0) {
totalDays = totalDays + now.getDate();
} else {
var curMonth = now.getMonth();
for (var count = 1; count <= curMonth; count++) {
totalDays = totalDays + days[count - 1];
}
totalDays = totalDays + now.getDate();
}
//得到第几周
var week = Math.ceil(totalDays / 7);
return week;
}