1. <!DOCTYPE html>
    2. <html lang="en">
    3. <head>
    4.     <meta charset="UTF-8">
    5.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
    6.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
    7.     <title>Document</title>
    8. </head>
    9. <body>
    10.     <script>
    11.         var arr =[1,2,3];
    12.         var res =arr.toString();
    13.         // Array 
    14.         // console.log(typeof res);
    15.         console.log(arr);
    16.         console.log(arr.__proto__);
    17.         console.log(arr.__proto__ == Array.prototype);
    18.         console.log(arr.__proto__.__proto__ ==Object.prototype);
    19.         console.log(arr.__proto__.__proto__.__proto__);
    20.         /*
    21.         1 在js中每一个对象都拥有一个_proto_指向其原型对象
    22.         */
    23.     </script>
    24. </body>
    25. </html>