获取当前日期时间（年月日、时分秒、星期）

    <div class="plane">
    <a id=clock></a>
    </div>

    <script type="text/javascript">
     //==================获取系统当前详细日期时间=================
     var clock = new Clock();
     clock.display(document.getElementById("clock"));
    function Clock() {
    var date = new Date();//实例一个时间对象
    this.year = date.getFullYear();//获取完整的年份（4位）
    this.month = date.getMonth() + 1;//获取当前月份，由于月份从0开始计算，要+1
    this.date = date.getDate();//获取当前日（1-31）
    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()];//获取星期
    this.hour = date.getHours() < 10 ? "0" + date.getHours() : date.getHours();//获取当前小时数（0-23）
    this.minute = date.getMinutes() < 10 ? "0" + date.getMinutes() : date.getMinutes();//获取当前分钟数（0-59）
    this.second = date.getSeconds() < 10 ? "0" + date.getSeconds() : date.getSeconds();//获取当前秒数（0-59）
    
    //当前详细日期时间
    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;
    };
    //间隔一秒执行一次获取当前时间的方法
    this.display = function (ele) {
       var clock = new Clock();
       ele.innerHTML = clock.toString();
       window.setTimeout(function(){clock.display(ele);}, 1000);
    };
    }
    </script>