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54.js构造函数原型

2022-04-13 21:34:58 作者：互联网

<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>

标签：date1,toStringByMy,54,innerHTML,js,let,Date,new,构造函数
来源： https://www.cnblogs.com/wgbl/p/16142130.html