js函数默认参数

    let data = {}
        data.a=1
        data.b=16
        function fa({a=1,b=3}){
            console.log(a)
            console.log(b)
        }
        fa(data)


        function fb(a=1,b=3){
            console.log(a)
            console.log(b)
        }
        fb()