给Date的构造函数添加属性和方法

Posted 2022-07-31 xinchenhui

  let d = Date.prototype;
  Object.defineProperties(d, 
    ‘year‘: 
      get: function ()  return this.getFullYear() ,
      set: function (y)  this.setFullYear(y) 
    ,
    ‘month‘: 
      get: function ()  return this.getMonth() + 1 ,
      set: function (m)  this.setMonth(m - 1) 
    ,
    ‘nowTime‘: 
      get: function ()  return `$this.getFullYear()-$this.getMonth() + 1-$this.getDate() $this.getHours():$this.getMinutes():$this.getSeconds()` 
    
  );
  d.asd = function asd(date) 
    return date || this.getDate();
  
  let date = new Date();
  date.nowTime; //2019-8-18 13:45:1
  date.year; //1999
  date.month; //10
  date.year = 1999;
  date.month = 10;
  date.year; //1999
  date.month; //10
  date.nowTime; // 1999-10-18 13:45:34

 

  //各种类型的构造函数
  console.log(String.prototype);
  console.log(Number.prototype);
  console.log(Array.prototype);
  console.log(Object.prototype);
  console.log(Date.prototype);