function formatMsgTime(timespan) {    var dateTime = parseDate(timespan);    var year = dateTime.getFullYear();    var month = dateTime.getMonth() + 1;    var day = dateTime.getDate();    var hour = dateTime.getHours();    var minute = dateTime.getMinutes();    minute = minute < 10 ? "0" + minute : minute    var second = dateTime.getSeconds();    var now = new Date();    var milliseconds = 0;    var timeSpanStr = "";    milliseconds = now.getTime() - dateTime.getTime();    var when = "";    if (hour < 6) when = "凌晨 "    else if (hour < 9) when = "早上 "    else if (hour < 12) when = "上午 "    else if (hour < 14) when = "中午 "    else if (hour < 17) when = "下午 "    else if (hour < 19) when = "傍晚 "    else if (hour < 22) when = "晚上 "    else when = "深夜 "    if (milliseconds <= 1000 * 30 * 1) {        timeSpanStr = '刚刚';    } else if (milliseconds <= 1000 * 60 * 1) {        timeSpanStr = '1分钟内';    } else if (1000 * 60 * 1 < milliseconds && milliseconds <= 1000 * 60 * 30) {        timeSpanStr = Math.round((milliseconds / (1000 * 60))) + '分钟前';    }    else if (1000 * 60 * 30 < milliseconds && milliseconds <= 1000 * 60 * 60) {        timeSpanStr = '半小时前';    }    else if (1000 * 60 * 60 < milliseconds && milliseconds <= (1000 * 60 * 60 * now.getHours() + 1000 * 60 * now.getMinutes() + 1000 * now.getSeconds() + now.getMilliseconds())) {        timeSpanStr = "今天" + when + hour + ":" + minute;    }    else if (1000 * 60 * 60 * now.getHours() < milliseconds && milliseconds <= 1000 * 60 * 60 * 24) {        timeSpanStr = '昨天' + when + hour + ":" + minute;    }    else if (1000 * 60 * 60 * 24 < milliseconds && milliseconds <= 1000 * 60 * 60 * 24 * 15) {        var d = Math.round(milliseconds / (1000 * 60 * 60 * 24));        if (d == 1 || (d == 2 && milliseconds == (1000 * 60 * 60 * now.getHours() + 1000 * 60 * now.getMinutes() + 1000 * now.getSeconds() + now.getMilliseconds()) + 86400000)) {            timeSpanStr += '昨天'        } else if (d == 2) {            timeSpanStr += '前天'        } else if (d == 3) {            timeSpanStr += '大前天'        } else {            timeSpanStr += Math.round(milliseconds / (1000 * 60 * 60 * 24)) + '天前';        }        timeSpanStr += when + hour + ":" + minute    }    else if (milliseconds > 1000 * 60 * 60 * 24 * 15 && year == now.getFullYear()) {        timeSpanStr = month + '月' + day + '日 ' + hour + ':' + minute;    } else {        timeSpanStr = year + '年' + month + '月' + day + '日 ' + hour + ':' + minute;    }    return timeSpanStr;}

var parseDate = function (dateString) {    return new Date(Date.parse(dateString.replace(/-/g, "/")));};