解构

var obj = {name:"cheng",age:20,sex:"男"}
        var {name,age,sex} = obj;
        console.log(name)
        function http({url,type="get",callback}){
            var data =20;
            console.log(url);
            console.log(type);
            callback(data)
        }
        http({
            url:"xxxx",
            callback:handleData
        })
        function handleData(res){
            console.log(res)
        }