obj_year.innerText=parseInt(num_year)+1; //年数增加

displayCalendar(obj_month.innerText-1,obj_year.innerText);

}

function plusyear()

{

var obj_year=document.getElementById("year");

var obj_month=document.getElementById("month");

var num_year=obj_year.innerText;

obj_year.innerText=parseInt(num_year)-1; //年数减少

displayCalendar(obj_month.innerText-1,obj_year.innerText);

}

function addmonth()

{

var obj_month=document.getElementById("month");

var obj_year=document.getElementById("year");

if(parseInt(obj_month.innerText)>=12) //月数增加到12时，年数相应增加1，月数从1开始

{

obj_month.innerText="0";

obj_year=document.getElementById("year");

var num_year=obj_year.innerText;

obj_year.innerText=parseInt(num_year)+1;

}

var num_month=obj_month.innerText;

obj_month.innerText=parseInt(num_month)+1; //月数增加

displayCalendar(obj_month.innerText-1,obj_year.innerText);

}

function plusmonth()

{

var obj_month=document.getElementById("month");

var obj_year=document.getElementById("year");

if(parseInt(obj_month.innerText)<=1) //月数减少到1时，年数相应减少1，月数从12开始

{

obj_month.innerText="13";

obj_year=document.getElementById("year");

var num_year=obj_year.innerText;

obj_year.innerText=parseInt(num_year)-1;

}

var num_month=obj_month.innerText;

obj_month.innerText=parseInt(num_month)-1; //月数减少