js 获取系统当前时间的代码

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<html><head lang="en">    <meta charset="utf-8"></head><body>    <div id="linkweb" style=" display:block;"></div>    <script>    var t = setInterval(date_now, 1000); //开始执行    function date_now() {        clearInterval(t); //清除定时器        var obj = new Date();        var date = obj.getFullYear() + "-" + isDouble(obj.getMonth() + 1) + "-" + isDouble(obj.getDate());        var time = obj.getHours() + ":" + obj.getMinutes() + ":" + obj.getSeconds();        var week = '星期' + '日一二三四五六'.charAt(obj.getDay());        document.getElementById("linkweb").innerHTML = date + week + time;        t = setInterval(date_now, 1000); //设定定时器，循环执行                }    function isDouble(number) {        var obj = parseInt(number);        obj > 9 ? obj = obj : obj = "0" + obj;        return obj;    }    </script></body></html>

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