this关键字制定对象的属性

时间：2022-08-09 05:41:00
<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Cars</title>

    <script>

        //每次引用属性started时，都在它前面加上this和句点

        //告诉Javascript解释器，你说的是当前对象的属性started

        //以免Javascript以为你引用的是一个变量

        var fiat = {

            make: "Fiat",

            model: "500",

            year: 1957,

            color: "Medium Blue",

            passengers: 2,

            convertible: false,

            mileage: 88000,

            started: false,

            start: function(){

                this.started = true;

            },

            stop: function(){

                this.started = false;

            },

            drive: function(){

                if (this.started){

                    alert("Zoom, Zoom!");

                } else {

                    alert("You need to start the engine first.");

                }

            }

        };

        fiat.drive();

        fiat.start();

        fiat.drive();

        fiat.stop();

    </script>

</head>

<body>

</body>

</html>

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