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<div class="showTime"></div>
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var t = null;
t = setTimeout(time, 1000); //檫始运行
function time() {
    clearTimeout(t); //清除定时器
    dt = new Date();
    var y = dt.getFullYear();
    var mt = dt.getMonth() + 1;
    var day = dt.getDate();
    var h = dt.getHours(); //获取时
    var m = dt.getMinutes(); //获取分
    var s = dt.getSeconds(); //获取秒
    document.querySelector(".showTime").innerHTML = '当前时间：' + y + "年" + mt + "月" + day + "-" + h + "时" + m + "分" + s + "秒";
    t = setTimeout(time, 1000); //设定定时器，循环运行     
}
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