本文实例为大家分享了js实现计算器功能的具体代码，供大家参考，具体内容如下
知识点
eval() 函数可计算某个字符串，并执行其中的的 javascript 代码。
代码如下
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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>js计算器</title>
<link href="../css/计算器.css" rel="stylesheet">
</head>
<body>
<h1 class="h1">计算器</h1>
<div class="box">
<form name="calculator">
<input type="button" id="clear" class="btn other" value="c">
<input type="text" id="display">
<br/>
<input type="button" class="btn number" value="7" onclick="get(this.value);">
<input type="button" class="btn number" value="8" onclick="get(this.value);">
<input type="button" class="btn number" value="9" onclick="get(this.value);">
<input type="button" class="btn operator" value="+" onclick="get(this.value);">
<br/>
<input type="button" class="btn number" value="4" onclick="get(this.value);">
<input type="button" class="btn number" value="5" onclick="get(this.value);">
<input type="button" class="btn number" value="6" onclick="get(this.value);">
<input type="button" class="btn operator" value="*" onclick="get(this.value);">
<br/>
<input type="button" class="btn number" value="1" onclick="get(this.value);">
<input type="button" class="btn number" value="2" onclick="get(this.value);">
<input type="button" class="btn number" value="3" onclick="get(this.value);">
<input type="button" class="btn operator" value="-" onclick="get(this.value);">
<br/>
<input type="button" class="btn number" value="0" onclick="get(this.value);">
<input type="button" class="btn operator" value="." onclick="get(this.value);">
<input type="button" class="btn operator" value="/" onclick="get(this.value);">
<input type="button" class="btn other" value="=" onclick="calculates();">
</form>
<div>
<script src="../js/计算器.js">
</script>
</body>
</html>
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.h1{
position: relative;
color:blueviolet;
font-size:50px;
text-align: center;
top:50px;
}
.box{
width:500px;
position: relative;
top: 100px;
left:50%;
margin-left: -250px;
text-align: center;
background: #495678;
padding:80px 0;
border-radius: 20px;
box-shadow: 4px 4px #3d4a65;
}
.btn{
background:rgba(255,192,203,0.8);
border: 1px solid pink;
cursor:pointer;
outline:none;
font-size:30px;
margin:10px 15px;
height: 70px;
width: 70px;
box-shadow: 0 5px #1a1313de;
}
.btn:active{
transform: translatey(2px);
}
.btn:first-child{
margin-left:-300px;
}
#display{
overflow: hidden;
box-sizing: border-box;
padding-right:18px;
text-align: right;
outline: none;
border:1px solid #4caf50;
color:yellow;
font-size: 30px;
width:280px;
position: absolute;
height: 50px;
top:95px;
right:55px;
background-color: #4caf50;
}
#display,.btn,.box{
border-radius:35px;
}
.operator{
background:orange;
}
.other{
background:white;
}
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//清空
document.getelementbyid("clear").addeventlistener("click",function(){
document.getelementbyid("display").value="";
});
//运算
function get(value) {
document.getelementbyid("display").value+=value;
}
//结果
function calculates() {
var result=0;
result=document.getelementbyid("display").value;
document.getelementbyid("display").value = eval(result);
}
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效果图
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/weixin_45596380/article/details/106007448