js实现月份左右切换

效果图：

点击左右边的箭头，实现上一月或者下一月的切换。

jsp内容

<!--时间月份选择框-->
<table id="querytable" style="border:1px;">
    <tr>
        <td style="width: 20%;">
            <span class="leftspan">
            	<span style="color:#FF0000;">
            		<img src="img/left.jpg" style="height:35px; width:35px;" onclick="reduceMonth()"/>
            	</span>
	    </span>
	</td>
	<td align="center">
		<label id="beginTime" class="kbtn" style="height:100px; width:200px;font-size: 35px;">	
		</label>
	</td>
	<td style="width: 20%;" align="right">
	    <span class="rightspan">
            	<span style="color:#FF0000;">
            		<img src="img/right.jpg" style="height:35px; width:35px;" onclick="addMonth()" />
            	</span>
	    </span>
	</td>
    </tr>
</table>

说明：

1）、箭头图片可以自行从网上下载

js内容

//月份加减处理
function addMonth() {
	var s = document.getElementById("beginTime").innerHTML;
	var arr = s.split("-");
	var year = parseInt(arr[0]);
	var month = parseInt(arr[1]);
	//判断month
	if (month == 12) {
		year = year + 1;
		month = 1;
	} else {
		month = month + 1;
	}
	document.getElementById("beginTime").innerHTML = year + "-" + month;
	initTable(year, month-1);
}

function reduceMonth() {
	var s = document.getElementById("beginTime").innerHTML;
	var arr = s.split("-");
	var year = parseInt(arr[0]);
	var month = parseInt(arr[1]);
	console.log(year + "/" + month);
	//判断month
	if (month == 1) {
		year = year - 1;
		month = 12;
	} else {
		month = month - 1;
	}
	document.getElementById("beginTime").innerHTML = year + "-" + month;
	initTable(year, month-1);
}

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参考文章

https://blog.csdn.net/sinat_16463137/article/details/61925606