<script>
      
        /*1.只有一个参数的时候*/
        var print1=obj => console.log(obj);
        print1("print1");//print1
        /*2.有两个参数的时候,且只有一行代码,return可以省略*/
        var print2=(a,b)=> a+b;
        console.log(print2(2, 3));//5
        /*3.当函数中有多行代码的时候,return不能省略*/
        var print3=(c,d)=>{
            console.log("c是"+c);//c是4
            console.log("d是"+d);//d是5
            return c+d;
        }
        console.log(print3(4,5));//9
        /*4.在json对象中使用箭头函数*/
        var name2="tangzhi";
        let  person={
            "name":"xiaozhi",
             eat1:function (foot = "鱼") {
                  //xiaozhi吃鱼
                  console.log(`${this.name}吃${foot}`);
             },
             //注意:箭头函数不能使用this
             //xiaozhi吃meet
             eat2:foot=>console.log(`${person.name}吃....${foot}`),
             eat3(foot){
                 //xiaozhi吃虾
                 console.log(`${this.name}吃${foot}`);
             }
        };
        person.eat1("鱼");
        person.eat2("meet");
        person.eat3("虾");

        /*5.箭头函数加对象解构*/
        var person2={
            "name":"xiaozhi",
            "age":25
        };
        //你好:xiaozhi
        var print5=({name})=>console.log("你好:"+name);
        print5(person2);
        
        //6.扩展运算符(...)用于取出参数对象所有可遍历属性然后拷贝到当前对象
        //1.深拷贝 Object { name: "TANGZHI", age: 25 }
        let person1 = { name: "TANGZHI", age: 25 }
        let someone = { ...person1 }
        console.log(someone);

        //2.合并对象
        let age = { age: 15 };
        let name = { name: "YANGXING" };
        let person2 = { ...age, ...name }
        //Object { age: 15, name: "YANGXING" }
        console.log(person2);
    </script>