ES6對象的擴展

       

        //對象的擴展的APPI
        a={
            name:"zhang",
            job:"solf"
        }
        b={
            age:15
        }
        let target={};
        Object.assign(target,a,b);//淺複製
        //console.log(target)

        //查看對象的枚舉性
        let mess=Object.getOwnPropertyDescriptor(a,"name")

        for(key in a){
           // console.log(key)
        }
        for(item of arr){  //不能用於對象
            //console.log(item)
        }
        console.log(Object.keys(a))//返回數組,都是下標或屬性
        console.log(Object.values(a))
        console.log(Object.entries(a))
        console.log(JSON.stringify(a))

       //對象和數組的解構

        let {name,job}=a

        console.log(name,job)

        let [a1,b1]=arr

        console.log(a1,b1)