解构

对象的函数解构 json

        let json = {
            'a' : 'liu',
            'b' : 'yuan',
            'c' : 'wai'
        }
        function func({a,b='刘员外',c}){
            console.log(a, b, c);
            
        }
        func(json)

数组的解构

        let arr = ['liu','yuan','wai']
        function func(a,b,c){
            console.log(a, b, c);
        }
        func(...arr)