点击一次按钮按钮的值显示在输出框中,在点击同一个按钮,输出框这个按钮的值消失,
点击一次按钮后,再在输入框中输入内容,同步显示在下面,下面输出框的值=按钮的值+输入框的值,再删除输入框的内容。下面输出框的值=按钮的值
附加要求

这部分按钮全部点击或者部分点击,显示顺序为:中35124
这部分按钮全部覅及或者部分点击,显示顺序为:下1 下7 下5 下13 下9(其余按顺序显示)
代码如下
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="maximum-scale=1.0,minimum-scale=1.0,user-scalable=0,width=device-width,initial-scale=1.0"/>
<meta name="format-detection" content="telephone=no,email=no,date=no,address=no">
<title>title</title>
<script src="https://code.jquery.com/jquery-3.2.1.js"></script>
<style>
.button{
width: 14%;
height: 45px;
}
.select{background: #aab1ff;}
input{vertical-align: top;}
</style>
</head>
<body>
<div id="content" style="margin: 20px">
<legend>:</legend>
<div style="height: 25px;line-height: 25px;"></div>
<input class="button" type="button" value="左1" style="width: 14%;height: 45px" >
<input class="button" type="button" value="左2" style="width: 14%;height: 45px" >
<input class="number" type="text" style="width: 15%;height: 40px">~
<input class="number" type="text" style="width: 15%;height: 40px">
<input class="button" type="button" value="右1" style="width: 14%;height: 45px" >
<input class="button" type="button" value="右2" style="width: 14%;height: 45px" >
<div style="height: 25px;line-height: 25px;margin-top: 10px"></div>
<input class="button" type="button" value="左3" style="width: 14%;height: 45px" >
<input class="button" type="button" value="左4" style="width: 14%;height: 45px" >
<input class="number" type="text" style="width: 15%;height: 40px;margin-right: 3px">-
<input class="number" type="text" style="width: 15%;height: 40px;margin-left: 3px">
<input class="button" type="button" value="右3" style="width: 14%;height: 45px" >
<input class="button" type="button" value="右4" style="width: 14%;height: 45px" >
<hr style="margin: 20px 0">
<p style="margin: 10px 0"></p>
<legend>:</legend><br />
<input type="button" value="中" class="button"> :
<input type="button" value="1" class="button">
<input type="button" value="2" class="button">
<input type="button" value="3" class="button">
<input type="button" value="4" class="button">
<input type="button" value="5" class="button">
<hr style="margin: 20px 0">
<legend>:</legend><br />
<input type="button" value="下1" class="button">
<input type="button" value="下2" class="button">
<input type="button" value="下3" class="button">
<input type="button" value="下4" class="button">
<br/>
<input type="button" value="下5" class="button">
<input type="button" value="下6" class="button">
<input type="button" value="下7" class="button">
<input type="button" value="下8" class="button">
<input type="button" value="下9" class="button">
<br/>
<input type="button" value="下10" class="button">
<input type="button" value="下11" class="button" style="width: 20%; height:45px">
<input type="button" value="下12" class="button" style="width: 20%; height:45px">
<input type="button" value="下13" class="button" style="width: 20%; height:45px">
<hr style="margin: 20px 0">
<div>
<legend>输出结果:</legend><br />
<input type="text" style="width: 99% ;height: 30px" id="text" value="">
<input type="button" value="确定" style="width: 100% ;height: 40px;margin-top: 10px">
</div>
</div>
</body>