最近看了一些关于面向对象的知识，最近工作中在做统计查询的时候需要用到本月、近三个月、今年的日期范围，所以下面用用面向对象的思想写了一个获取日期的插件，大家可以借鉴使用。
直接通过new DateHelp就可以调用了
var myDate = new DateHelp({
date:'2015-02-01',//从此日期开始计算
format:'yyyy/MM/dd'
});
myDate.getThisMonth();
myDate.getThreeMonth();
myDate.getThisYear();
dateHelp.js插件
/** * 通过调用可以获取本月，近三个月，今年的日期 * @param obj * @constructor */ function DateHelp(obj) { /*var obj = { date:'2015-02-01',//从此日期开始计算 type:'month',//以年月日向前计算：年（year），月（month），日（day） value:'14',//向前计算的数值，年月日 format:'yyyy/mm/dd'//日期格式 }*/ this.date = obj.date; this.type = obj.type; this.value = obj.value == undefined ? obj.value : 0; this.format = obj.format == undefined ? obj.format: 'yyyy/MM/dd'; //日期和非日期格式获取年月日 if (this.date instanceof Date){ //处理传进来的是日期函数的 this.year = this.date.getFullYear(); this.month = this.date.getMonth()+1; this.day = this.date.getDate(); }else{ //处理传入的是非日期函数的 this.year = this.date.substr(0, 4); this.month = this.date.substr(5, 2); this.day = this.date.substr(8, 2); } } DateHelp.prototype.beforeDate = function(type, value){ var _type = type || this.type, _value = value || this.value, _year = this.year, _month = this.month, _day = this.day; if (_type == 'year' || _type == '年'){ _year -= _value; }else if (_type == 'month' || _type == '月'){ _year -= parseInt(_value / 12); _month -= _value % 12; if(_month <= 0){ _year -= 1; _month += 12; } }else if (_type == 'day' || _type == '日'){ }else { } var date = new Date(_year, _month - 1, _day) return this.formatDate(date, this.format); } DateHelp.prototype.formatDate = function(date,fmt){ var o = { "M+" : date.getMonth()+1, //月份 "d+" : date.getDate(), //日 "h+" : date.getHours(), //小时 "m+" : date.getMinutes(), //分 "s+" : date.getSeconds(), //秒 "q+" : Math.floor((date.getMonth()+3)/3), //季度 "S" : date.getMilliseconds() //毫秒 }; if(/(y+)/.test(fmt)) fmt=fmt.replace(RegExp.$1, (date.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; } DateHelp.prototype.getThisMonth = function() { var first = new Date(this.year, this.month - 1); var last = new Date(this.year, this.month, 0); return this.formatDate(first, this.format) + " - " + this.formatDate(last, this.format); } DateHelp.prototype.getThreeMonth = function() { return this.beforeDate('month', 3) + " - " + this.beforeDate('day', 0); } DateHelp.prototype.getThisYear = function() { var first = new Date(this.year, 0, 1); var last = new Date(this.year, 11, 31); return this.formatDate(first, this.format) + " - " + this.formatDate(last, this.format); } /* //示例 var myDate = new DateHelp({ date:'2015-02-01',//从此日期开始计算 format:'yyyy/MM/dd' }); console.log(myDate.getThisMonth()); console.log(myDate.getThreeMonth()); console.log(myDate.getThisYear());*/
html测试代码
<!DOCTYPE html> <html> <head lang="en"> <meta charset="UTF-8"> <title></title> <script src="myJs/dateHelp.js"></script> </head> <body> <script> var myDate = new DateHelp({ date:new Date(),//从此日期开始计算 format:'yyyy/MM/dd' }); console.log(myDate.getThisMonth()); console.log(myDate.getThreeMonth()); console.log(myDate.getThisYear()); </script> </body> </html>