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
<!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="/UploadFiles/2021-04-02/计算器.js">.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; }//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); }效果图
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