对象

/**
 * 对象的增删改查
 */
var obj = {
    name:"abc",
    age:40,
    sex:"male",
    health : 100,
    somke:function () {
        console.log("xxxxxxxxxxa ");
        this.health--
    },
    drink:function () {
        console.log("hhhhhhhhhhh");
        this.health++
    }
}
/**
 * 增加属性,直接增加
 */
obj.wife = "none";
/**
 * 改变属性，直接改变
 */
obj.wife = "hahaha";
/**
 * 删除属性
 */
delete obj.name

/**
 * 对象创建方法
 */
1 var obj={}  对象字面量方法
2 构造函数  大驼峰式    TheFirstName（）
    1）系统自带构造函数 new Object()
   var obj = new Object()

function Car() {
    this.name = "BMW" ;
    this.height = "1400";
    this.lang = "4900";
    this.weight = "1000"
}
var car  =new Car();
var car1  =new Car();
car.name = "奔驰";
car1.name = "布加迪";
//独立
console.log(car)
console.log(car1)

function Student(name,age,sex) {
    this.name = name;
    this.age = age;
    this.sex = sex
}

var stydent1 = new Student("BMW","19","MALE")

console.log(stydent1) //Student {name: "BMW", age: "19", sex: "MALE"}

var num =4;
num.len = 3;
console.log(num.len) //undefined

var str = "abcd";
str.length = 2;
console.log(str) //abcd

var str = "abc";
str+=1;
var test = typeof str;
if(test.length == 6){
    test.sign = "哈哈哈哈或或或或或或或"

}
console.log(test.sign)  //undefined

/**
 * 例题
 */
var a = 5;
function test() {
    a = 0;
    console.log(a);
    console.log(this.a);
    var a;
    console.log(a)
}
//test();  // 0 5 0
var temp = new test();
console.log(temp)  //0 undefined 0

function Person(name,age,sex) {
    var a=0;
    this.name = name;
    this.age= age;
    this.sex = sex;
    function sss() {
        a ++ ;
        console.log(a)
    }
    this.say = sss;
}
var oPerson = new Person()
oPerson.say();  //1
oPerson.say();  //2
var oPerson1 = new Person();
oPerson1.say(); //1