获取当前的系统时间显示在自己的项目上

首先在页面中我们直接写一个标签，然后给标签定义一个id，这里我们用什么标签都可以，我们就用<span></span>演示吧，

代码如下：

<span id="clock" ></span>
    <script type="text/javascript">
    var clock = new Clock();
    clock.display(document.getElementById("clock"));
    </script>

上面我们实例化了一个Clock的对象，这里我们就在外部定义一个Clock的类，

获取当前时间并进行时间的格式化，代码如下：

function Clock() {
    var date = new Date();
    this.year = date.getFullYear();
    this.month = date.getMonth() + 1;
    this.date = date.getDate();
    this.day = new Array("星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六")[date.getDay()];
    this.hour = date.getHours() < 10 ? "0" + date.getHours() : date.getHours();
    this.minute = date.getMinutes() < 10 ? "0" + date.getMinutes() : date.getMinutes();
    this.second = date.getSeconds() < 10 ? "0" + date.getSeconds() : date.getSeconds();

    this.toString = function() {
        return "现在是:" + this.year + "年" + this.month + "月" + this.date + "日 " + this.hour + ":" + this.minute + ":" + this.second + " " + this.day; 
    };
    
    this.toSimpleDate = function() {
        return this.year + "-" + this.month + "-" + this.date;
    };
    
    this.toDetailDate = function() {
        return this.year + "-" + this.month + "-" + this.date + " " + this.hour + ":" + this.minute + ":" + this.second;
    };
    
    this.display = function(ele) {
        var clock = new Clock();
        ele.innerHTML = clock.toString();
        window.setTimeout(function() {clock.display(ele);}, 1000);
    };
}

之后我们在页面头部中引入该js就好了：

<script src="js/Clock.js" type=text/javascript></script>

显示效果：