属性拼接

  //var obj = {
  // name: "abc"
  //}
  //访问属性的方法
  //1、obj.naem -->这种在系统内自动转化为第二种
  //2、obj['name']
  //第二种更灵活，可以用于连接属性名，变量外字符用‘’引号

  var deng = {
      wife1: "xiaoliu",
      wife2: "xiaowang",
      wife3: "xiaomeng",
      wife4: "xiaohan",
      callWife: function(num) {
          console.log(deng['wife' + num]);
      }
  }

  //仿jQuery实现方法的连续多次调用
  //$("div").css("width","10px").css("height","20px");
 var deng = {
     smoke: function () {
         console.log('Smoking.....cool!!');
         return this;
     },
     drink: function () {
         console.log("Drink...");
         return this;
     },
     perm: function () {
         console.log("perm,cool!");
         return this;
     }
 }

  //对象枚举
  var obj = {
      name: "12",
      age: 123,
      sex: "male",
      height: 180,
      weight: 75,
      prop: 890
  }
  for (var prop in obj) {
      console.log(obj.prop);
  }

 //console.log(obj.prop);-->obj['prop']
      console.log(prop + ": " + obj[prop]);

 __proto__: {
          lastName: "deng"
      }
` if(obj.hasOwnProperty(prop)) {
          console.log(prop + ": " + obj[prop]);
      }``