獲取當前的系統時間顯示在自己的項目上

首先在頁面中我們直接寫一個標簽，然後給標簽定義一個id，這裡我們用什麼標簽都可以，我們就用<span></span>演示吧，

代碼如下：

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

上面我們實例化了一個Clock的對象，這裡我們就在外部定義一個Clock的類，

獲取當前時間併進行時間的格式化，代碼如下：

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 "現在是:" + 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);
    };
}

之後我們在頁面頭部中引入該js就好了：

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

顯示效果：