54.js构造函数原型

<head>
    <meta charset="UTF-8">
    <title>3.js对象构造原型</title>
</head>
<body>
    <div id="test1"></div>
    <div id="test2"></div>
</body>
<script>
    //不能在通过构造原型添加内容之前使用
    // let date1 = new Date(1998, 8-1, 8,  20, 18, 28);
    // document.getElementById("test2").innerHTML = date1.toStringByMy();

    //为Date添加格式化方法
    Date.prototype.toStringByMy = function () {
        let year = this.getFullYear()
            , month = this.getMonth() + 1
            , date = this.getDate()
            , hour = this.getHours()
            , min = this.getMinutes()
            , sec = this.getSeconds();
        let msg = year + "-" + month + "-" + date + " " + hour + ":" + min + ":" + sec;
        return msg;
    }

    //创建日期对象
    let now = new Date();
    document.getElementById("test1").innerHTML = now.toStringByMy();

    let date1 = new Date(1998, 8-1, 8,  20, 18, 28);
    document.getElementById("test2").innerHTML = date1.toStringByMy();

</script>
posted on 2022-04-13 21:18 小小程序猿level1 阅读(23) 评论(0) 收藏举报