js日期插件dateHelp获取本月、三个月、今年的日期

2019-11-20 10:26:24

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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>

希望本文所述对大家学习javascript程序设计有所帮助。

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