javascript实现封装简单电子钟表组件代码-js教程-PHP中文网

前几天想在我的个人主页上的右上角，添加一个可拖拽的电子钟表，然后趁这些天有点闲空，顺便简单复习下面向对象编程，所以花了点时间搞出来了，样子如下：

其实这个案例很简单，就是简单的利用了下Date类和定时器，当然写这个例子也只是为了稍稍复习下前端的知识，封装成了一个组件

代码如下：

(function (window, undefined) {

    function Time()
    {

        this.clock = null;

        this.date = new Date();

        this.month = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];

        this.day = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Friday', 'Saturday'];

        this.str = '11:34 Tuesday30August ';
    }

    Time.prototype = {

        constructor: 'Time',

        init: function (selector)
        {

            this.createHTML(selector);

            this.getTime();

            this.getDay();

        },

        createHTML: function (selector)
        {

            var elem = document.querySelector(selector);

            this.clock = elem;

            elem.innerHTML = this.str;

        },

        getTime: function ()
        {

            var clock = this.clock;

            var hour = clock.getElementsByClassName('cth_hour')[0];

            var minute = clock.getElementsByClassName('cth_min')[0];

            var point = clock.getElementsByClassName('cth_point')[0];

            var date = this.date;

            var date_hour = this.addZoom(date.getHours()); //时
            var date_minutes = this.addZoom(date.getMinutes()); //分

            hour.innerHTML = date_hour;

            minute.innerHTML = date_minutes;

            var num = 0;

            var timer = setInterval(function () {

                    if (num % 2 == 1) {

                        point.style.visibility = 'visible';

                    } else {

                        point.style.visibility = 'hidden';

                    }

                    num++;

                },
                500);

            var This = this;

            var timer2 = setInterval(function () {

                    var date = new Date();

                    hour.innerHTML = This.addZoom(date.getHours());

                    minute.innerHTML = This.addZoom(date.getMinutes());

                },
                30000);

        },

        getDay: function ()
        {

            var clock = this.clock;

            var dates = clock.getElementsByClassName('cdm_date')[0];

            var day = clock.getElementsByClassName('cdm_day')[0];

            var month = clock.getElementsByClassName('cdm_month')[0];

            var date = this.date;

            var date_day = date.getDay(); //星期
            var date_date = date.getDate(); //日
            var date_month = date.getMonth(); //月

            dates.innerHTML = this.day[date_day];

            day.innerHTML = this.addZoom(date_date);

            month.innerHTML = this.month[date_month * 1];

        },

        addZoom: function (para)
        {

            var str = '';

            if (para < 10)
            {
                str = '0' + para;
            } else
            {
                str = para;
            }

            return str;

        }

    }

    DesktopTime = Time;

})(window);

当然我是通过函数自执行的方式编写的函数，这样的好处就是避免了变量的重复，当然坏处就是，不好取函数里面的值，所以通过把Time类赋值给全局变量DesktopTime，将Time的prototype间接地给暴露出来，然后进行调用初始化。