微信关闭网页触发事件/

<script> 
//初始化开始时间
    var sTime = new Date();
//初始化结束始时间
    var eTime = new Date();
    window.addEventListener('pagehide',
        function () {

            eTime = new Date();

            var sStr = generateTimeReqestNumber(sTime);
            var eStr = generateTimeReqestNumber(eTime);

            console.log(sStr);
            console.log(eStr);
            console.log(console.log(Math.floor((eTime - sTime) / 1000)));

            $.post("http://fin.allinpaysc.com:18002/water/visit",function () { }, "json");

        });
//计算带0的
    function pad2(n) {

        return n < 10 ? '0' + n : n;
    }
//计算时间
    function generateTimeReqestNumber(date) {

        return date.getFullYear().toString() + pad2(date.getMonth() + 1) + pad2(date.getDate()) + pad2(date.getHours()) + pad2(date.getMinutes()) + pad2(date.getSeconds());
    }
</script>