Javascript实现 前一天 今天 后一天

<script language ="javascript" type ="text/javascript">               function UpdateSrc()        {            if(document.getElementById ("txt_Time").value=="")            {                alert ("请选择时间");                return ;            }            document.getElementById("report").src = "AutoMPSSysList.aspx?Date=" + document.getElementById("txt_Time").value;        }       

    function changedate(val) {        var currdate = document.getElementById("txt_Time");        var date = new Date();        if (val == 0) {            currdate.value = date.getYear() + "-" + (date.getMonth() + 1) + "-" + date.getDate();        }        else {            if (chkdate(currdate.value)) {                var dates = currdate.value.split("-");                dates[1] = dates[1].replace(/^0/g, '');                dates[2] = dates[2].replace(/^0/g, '');                var da = DayAddDiff(parseInt(dates[0]), parseInt(dates[1]), parseInt(dates[2]), val);            }            else {                var da = DayAddDiff(parseInt(date.getYear()), parseInt(date.getMonth() + 1), parseInt(date.getDate()), val);            }            currdate.value = da;        }        document.all.form1.ipSearch.onclick();    }

function DayAddDiff(year, month, day, diff){ var numDays = new Array(31,28,31,30,31,30,31,31,30,31,30,31); var isLeap = false; var newyear = year; var newmonth = month - 1; var n = numDays[newmonth]; var newday = day; var newdiff = diff; var ln; if (newmonth == 0)  ln = 31; else if(newmonth == 11)  ln = 31; else  ln = numDays[newmonth + 1]; if (diff != 0){  //判断是否润年  if (year % 4 == 0) {   if (year % 100 != 0)    isLeap = true;   else {    if (year % 400 == 0)     isLeap = true;   }  }  if (newmonth == 1 && isLeap)   ++n;     if (newmonth == 0 && isLeap)    ++ln;  //加值  var newday = day + newdiff;  if (newday > 0) {   if (newday > n) {    newday = newday - n;    if (newmonth == 11)     {     newmonth = 0;     newyear += 1;     newdiff = newday - 1;     return DayAddDiff(newyear, newmonth + 1, 1, newdiff);    }    else {     newmonth += 1     newdiff = newday - 1;     return DayAddDiff(newyear, newmonth + 1, 1, newdiff);    }   }  }  else if (newday == 0) {   if (newmonth == 0)    {    newmonth = 11    newyear += -1;    newday = 31;   }   else {    newmonth += -1    newday = numDays[newmonth];   }  }  else {   if (newmonth == 0)    {    newmonth = 11    newyear += -1;    newdiff = newday;    newday = 31;    return DayAddDiff(newyear, newmonth + 1, newday, newdiff);   }   else {    newmonth += -1;    newdiff = newday;    newday = ln;    return DayAddDiff(newyear, newmonth + 1, newday, newdiff);   }  } } //输出字符串 var daystring = ""; daystring += year; newmonth += 1; //if (newmonth < 10) //    daystring += "-0" + newmonth; //else  daystring += "-" + newmonth; //if (newday < 10) //    daystring += "-0" + newday; //else  daystring += "-" + newday; return daystring;}

function chkdate(datestr) {    var lthdatestr    if (datestr != "")        lthdatestr = datestr.length;    else        lthdatestr = 0;

    var tmpy = "";    var tmpm = "";    var tmpd = "";    var datestr;    var status;    status = 0;    if (lthdatestr == 0)    //alert("日期不能为空!")        return false;

    for (i = 0; i < lthdatestr; i++) {        if (datestr.charAt(i) == '-') {            status++;        }        if (status > 2) {            // alert("日期格式错误!");            return false;        }        if ((status == 0) && (datestr.charAt(i) != '-')) {            tmpy = tmpy + datestr.charAt(i)        }        if ((status == 1) && (datestr.charAt(i) != '-')) {            tmpm = tmpm + datestr.charAt(i)        }        if ((status == 2) && (datestr.charAt(i) != '-')) {            tmpd = tmpd + datestr.charAt(i)        }

    }    year = new String(tmpy);    month = new String(tmpm);    day = new String(tmpd)    tempdate = new String(year + month + day);    //alert(tempdate);    if ((tmpy.length != 4) || (tmpm.length > 2) || (tmpd.length > 2)) {        //alert("日期格式错误!");        return false;    }    if (!((1 <= month) && (12 >= month) && (31 >= day) && (1 <= day))) {        //alert ("日期格式错误!");        return false;    }    if (!((year % 4) == 0) && (month == 2) && (day == 29)) {        //alert ("日期格式错误!");        return false;    }    if ((month <= 7) && ((month % 2) == 0) && (day >= 31)) {        //alert ("日期格式错误!");        return false;

    }    if ((month >= 8) && ((month % 2) == 1) && (day >= 31)) {        //alert ("日期格式错误!");        return false;    }    if ((month == 2) && (day == 30)) {        //alert("日期格式错误!");        return false;    }    //alert("对啦");    return true;}

    </script>

 选择时间：    <asp:TextBox ID="txt_Time" runat ="server" ></asp:TextBox>                    <input id="ipSearch" type="button" value="确定" class="btn_57" οnclick="UpdateSrc()" />                                             <a href="javascript:" οnclick="javascript:changedate(-1)">前一天</a>                     <a href="javascript:" οnclick="javascript:changedate(0)">今天</a>                     <a href="javascript:" οnclick="javascript:changedate(1)">后一天</a>

转载于:https://www.cnblogs.com/liyuxin/archive/2011/05/13/2045107.html

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