<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
*{
margin: 0 auto;
padding: 0;
}
#waikuang{
width: 315px;
height: 400px;
background-color: lightblue;
border: 1px solid black;
}
#inp_div{
width: 313px;
height: 30px;
border: 1px solid black;
}
#inp_div input{
width: 313px;
height: 30px;
border: none;
}
.tr{
width: 370px;
height: 90px;
}
.num{
width: 70px;
height: 80px;
float: left;
background-color: darkgray;
margin-left: 7px;
text-align: center;
line-height: 80px;
margin-top: 8px;
border-radius: 5px;
}
.num:hover{
cursor: pointer;
box-shadow: 0px 2px 2px lightcoral;
}
</style>
</head>
<body>
<div id="waikuang">
<div id="inp_div">
<input type="text" name="" id="jsinput" value="" />
</div>
<div class="tr">
<div class="num">7</div>
<div class="num">8</div>
<div class="num">9</div>
<div class="num">/</div>
</div>
<div class="tr">
<div class="num">4</div>
<div class="num">5</div>
<div class="num">6</div>
<div class="num">*</div>
</div>
<div class="tr">
<div class="num">1</div>
<div class="num">2</div>
<div class="num">3</div>
<div class="num">-</div>
</div>
<div class="tr">
<div class="num">0</div>
<div class="num">.</div>
<div class="num">+</div>
<div class="num">=</div>
</div>
</div>
</body>
</html>
<script type="text/javascript">
var num = document.getElementsByClassName("num");
var one = 0;
var two = 0;
var fuhao = "";
var biao = 0;
for(var i = 0;i<num.length;i++){
num[i].onclick = function(){
biao++;
document.getElementById("jsinput").value=this.innerHTML;
if(biao==1){
one = parseInt(this.innerHTML);
}
else if(biao==2){
fuhao = this.innerHTML;
}
else if(biao==3){
two = parseInt(this.innerHTML);
}
if(this.innerHTML=="="){
switch(fuhao){
case"+":
document.getElementById("jsinput").value = one + two;
break;
case"-":
document.getElementById("jsinput").value = one - two;
break;
case"*":
document.getElementById("jsinput").value = one * two;
break;
case"/":
document.getElementById("jsinput").value = one / two;
break;
}
}
}
}
</script>
