js 上一天、下一天

function Previousday() {

    var curDate = new Date(CreateDate_Temp);
    var preDate = new Date(curDate.getTime() -  *  *  * );

    var strDate = preDate.getFullYear() + "-";
    strDate += preDate.getMonth() +  + "-";
    strDate += preDate.getDate() + "-";
    strDate += preDate.getHours() + ":";
    strDate += preDate.getMinutes() + ":";
    strDate += preDate.getSeconds();
    $("#CreateDate").datebox("setValue", strDate);
    CreateDate_Temp = $('#CreateDate').datebox('getValue');
}
function NextDay() {

    // var nextDate = new Date(curDate.getTime() + 24*60*60*1000);
    var curDate = new Date(CreateDate_Temp);
    var nextDate = new Date(curDate.getTime() +  *  *  * );

    var strDate = nextDate.getFullYear() + "-";
    strDate += nextDate.getMonth() +  + "-";
    strDate += nextDate.getDate() + "-";
    strDate += nextDate.getHours() + ":";
    strDate += nextDate.getMinutes() + ":";
    strDate += nextDate.getSeconds();
    $("#CreateDate").datebox("setValue", strDate);
    CreateDate_Temp = $('#CreateDate').datebox('getValue');
}

<a href="javascript:void(0)" class="easyui-linkbutton" onclick="Previousday()">上一天</a>
                    <a href="javascript:void(0)" class="easyui-linkbutton" onclick="NextDay()">下一天</a>

<input id="CreateDate" name="CreateDate" class="easyui-datebox"></input>