4.演员名join连接数组示例

<p id="app"></p>
    <script>
        var director = [
        {name:"吴京",id:001},
        {name:"章子怡",id:002},
        {name:"徐峥",id:003},
 ]
        var arr = [ ];
         for(var i=0;i<director.length;i++){
             console.log(director[i].name)
             arr.push(director[i].name)  
         }
         console.log(arr);
        //  2.
        var str = arr.join("/");
        console.log(str)
        // 3.
        var app = document.getElementById("app");
        app.innerHTML = str;
    </script>