function get_date() {

        var date = new Date();
        var year = "";
        var month = "";
        var day = "";
        var week = "";
        var hour = "";
        var minute = "";
        var second = "";
        var val = "";
        year = date.getYear();
        month = add_zero(date.getMonth() + 1);
        day = add_zero(date.getDate());
        week = date.getDay();
        switch (week) {
            case 0: val = "星期天"; break
            case 1: val = "星期一"; break
            case 2: val = "星期二"; break
            case 3: val = "星期三"; break
            case 4: val = "星期四"; break
            case 5: val = "星期五"; break
            case 6: val = "星期六"; break
        }
        hour = add_zero(date.getHours());
        minute = add_zero(date.getMinutes());
        second = add_zero(date.getSeconds());
        timeDiv.innerText = " " + year + "-" + month + "-" + day + "   " + val + "    " + hour + ":" + minute + ":" + second;
    }
    //如果传入的值小于10，则在传入值前面补0 
    function add_zero(temp) {
        if (temp < 10) {
            return "0" + temp;
        } else {
            return temp;
        }
    }
    //每秒调用get_date()函数 
    setInterval("get_date()", 1000);