6-2 generator

    <script>
        function *gen(x){
            yield x+2;
            yield 7;
            return x;
        }
        /* generator函数遇到yield关键字 函数会暂停 yield将函数切割了
        next()方法会返回一个对象
         */
        var g = gen(3);
        console.log(g.next())//{value: 5, done: false}
        console.log(g.next()) //{value:7,done:false}
        console.log(g.next()) //{value: 3, done: true}
    </script>

    <script>
        function *go(x){
            var y = yield x+2;
            console.log(y)      //7
            var z =  yield y+10;
            console.log(z);    //8
            return 4;
        }
        var obj = go(3);
        console.log(obj.next())   //{value: 5, done: false}
        console.log(obj.next(7))  //{value: 17, done: false}  
        console.log(obj.next(8))  //{value: 4, done: true}
    </script>

    <script>
        var baseUrl = "http://192.168.14.49:5000/"
        function http(url){
            return $.ajax({
                url:baseUrl+url,
                dataType:"json"
            })
        }
        function *getData(){
            var id = yield http("top/playlist");
            console.log(id);
            yield http(`playlist/detail?id=${id}`);
        }
        var res  = getData();
       res.next().value.then(data=>{
           var {id,name} = data.playlists[0];
           res.next(id).value.then(res=>{
               console.log(res)
           })
       })
    </script>