<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<style type="text/css">
*{
margin: 0;
padding: 0;
}
#main{
width: 500px;
height: 650px;
background-color: pink;
margin: 50px auto;
position: relative;
}
#text{
position: absolute;
width: 500px;
height: 200px;
background-color: #ececec;
border: 0px;
}
#main2{
position: absolute;
top: 200px;
width: 500px;
height: 450px;
background-color: paleturquoise;
}
#main2 input{
width:154px;
padding: 0px;
margin: 0px;
height:110.5px ;
border: 1px solid blue;
margin-left: 7px;
color: #FFFFFF;
margin-top: 2px;
font-size: 28px;
}
#text{
font-size: 48px;
}
</style>
<title>Document</title>
</head>
<body>
<div id="main">
<input type="text" id="text" value="" />
<div id="main2">
<input type="button" value="1" id="1" onclick="addClick(this.value)"/>
<input type="button" value="2" id="2" onclick="addClick(this.value)"/>
<input type="button" value="3" id="3" onclick="addClick(this.value)"/>
<input type="button" value="4" id="4" onclick="addClick(this.value)"/>
<input type="button" value="5" id="5" onclick="addClick(this.value)"/>
<input type="button" value="6" id="6" onclick="addClick(this.value)"/>
<input type="button" value="7" id="7" onclick="addClick(this.value)"/>
<input type="button" value="8" id="8" onclick="addClick(this.value)"/>
<input type="button" value="9" id="9" onclick="addClick(this.value)"/>
<input type="button" value="0" id="0" onclick="addClick(this.value)"/>
<input type="button" value="*" id="adds" onclick="addClick(this.value)" />
<input type="button" value="=" id="sum" onclick="addClick(this.value)" />
</div>
</div>
<script>
function addClick(value){
var text=document.getElementById('text');
text.value+=value;
}
var sum=document.getElementById('sum')
sum.onclick=function(){
var text=document.getElementById('text');
var sun=eval(text.value)
text.value=sun
}
</script>
</body>
</html>