ES6对象的扩展

       

        //对象的扩展的APPI
        a={
            name:"zhang",
            job:"solf"
        }
        b={
            age:15
        }
        let target={};
        Object.assign(target,a,b);//浅复制
        //console.log(target)

        //查看对象的枚举性
        let mess=Object.getOwnPropertyDescriptor(a,"name")

        for(key in a){
           // console.log(key)
        }
        for(item of arr){  //不能用于对象
            //console.log(item)
        }
        console.log(Object.keys(a))//返回数组,都是下标或属性
        console.log(Object.values(a))
        console.log(Object.entries(a))
        console.log(JSON.stringify(a))

       //对象和数组的解构

        let {name,job}=a

        console.log(name,job)

        let [a1,b1]=arr

        console.log(a1,b1)