var currDT;var aryDay = new Array("日", "一", "二", "三", "四", "五", "六");//初始页面 function initWeek() {    currDT = new Date();    showDate();}//上一周 或 下一周 function addWeek(ope) {    var num = 0;    if (ope == "-") {        num = -7;    }    else if (ope == "+") {        num = 7;    }    currDT = addDate(currDT, num);    //showDate();    return currDT;}function showDate() {    //span1.innerHTML = currDT.toLocaleDateString(); //显示日期     var dw = currDT.getDay();    var tdDT;    //确定周一是那天     if (dw == 0) {        tdDT = addDate(currDT, -6);    }    else {        tdDT = addDate(currDT, (1 - dw));    }    //在表格中显示一周的日期     var objTB = document.getElementById("trWeek");    for (var i = 0; i < 7; i++) {        if (tdDT.toLocaleDateString() == currDT.toLocaleDateString()) {            objTB.cells[i + 1].style.color = "red"; //currDT突出显示         }        dw = tdDT.getDay();        objTB.cells[i + 1].innerHTML = "星期" + aryDay[dw] + "<br />[" + tdDT.getFullYear() + "-" + (tdDT.getMonth() + 1) + "-" + tdDT.getDate() + "]";        tdDT = addDate(tdDT, 1); //下一天     }}//增加或减少若干天，由 num 的正负决定，正为加，负为减 function addDate(dt, num) {    var ope = "+";    if (num < 0) {        ope = "-";    }    var reDT = dt;    for (var i = 0; i < Math.abs(num) ; i++) {        reDT = addOneDay(reDT, ope);    }    return reDT;}//增加或减少一天，由ope决定, + 为加，- 为减，否则不动 function addOneDay(dt, ope) {    var num = 0;    if (ope == "-") {        num = -1;    }    else if (ope == "+") {        num = 1;    }    var y = dt.getFullYear();    var m = dt.getMonth();    var lastDay = getLastDay(y, m);    var d = dt.getDate();    d += num;    if (d < 1) {        m--;        if (m < 0) {            y--;            m = 11;        }        d = getLastDay(y, m);    }    else if (d > lastDay) {        m++;        if (m > 11) {            y++;            m = 0;        }        d = 1;    }    var reDT = new Date();    reDT.setYear(y);    reDT.setMonth(m);    reDT.setDate(d);    return reDT;}//是否为闰年 function isLeapYear(y) {    var isLeap = false;    if (y % 4 == 0 && y % 100 != 0 || y % 400 == 0) {        isLeap = true;    }    return isLeap;}//每月最后一天 function getLastDay(y, m) {    var lastDay = 28;    m++;    if (m == 1 || m == 3 || m == 5 || m == 7 || m == 8 || m == 10 || m == 12) {        lastDay = 31;    }    else if (m == 4 || m == 6 || m == 9 || m == 11) {        lastDay = 30;    }    else if (isLeapYear(y) == true) {        lastDay = 29;    }    return lastDay;}//获取任意周的开始时间function getAnyWeekStart(date) {    var currentDay = date.getDay();    if (currentDay == 0) { currentDay = 7; }    var mondayTime = date.getTime() - (currentDay - 1) * 24 * 60 * 60 * 1000;    var startTime = new Date(mondayTime).toLocaleDateString();    return startTime;    }//获取任意周的结束时间function getAnyWeekEnd(date) {    var currentDay = date.getDay();    if (currentDay == 0) { currentDay = 7; }    var sundayTime = date.getTime() + (7 - currentDay) * 24 * 60 * 60 * 1000;    var endTime = new Date(sundayTime).toLocaleDateString();    return endTime;}