js实现简易计算器小功能

站长资源 2024/12/23 佚名

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本文实例为大家分享了js实现简易计算器的具体代码，供大家参考，具体内容如下

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <title>Document</title>
<style>

 ul li{
 list-style: none;
 line-height: 50px;
 }
 .getAnswer{
 width: 20px;
 }
</style>
</head>
<body>
 <form name="calc">
 <h2>简易计算器</h2>
 <ul>
 <li> 第一个数： <input type="text" name="num1" ></li>
 <li> 第二个数： <input type="text" name="num2"></li>
 <li> <input name="getAnswer" type="button" onclick="calcu1()" value="+">
 <input name="getAnswer" type="button" onclick="calcu2()" value="-">
 <input name="getAnswer" type="button" onclick="calcu3()" value="*">
 <input name="getAnswer" type="button" onclick="calcu4()" value="/">
 </li>
 <li>计算结果： <input type="text" name="result" id="result"> </li>
 </ul>
 </form>

 <script type="text/javascript">
 
 function calcu1() {
 var num1=document.calc.num1.value;
 var num2=document.calc.num2.value;
 sum1=parseFloat(num1) + parseFloat(num2); 
 var total = num1+"+"+num2+"="+sum1;  
 document.calc.result.value=total; 
 }
 function calcu2() {
 var num1=document.calc.num1.value;
 var num2=document.calc.num2.value;
 sum1=parseFloat(num1) - parseFloat(num2);
 var total = num1+"-"+num2+"="+sum1; 
 document.calc.result.value=total; 
 }
 function calcu3() {
 var num1=document.calc.num1.value;
 var num2=document.calc.num2.value;
 var total = num1+"*"+num2+"="+parseFloat(num1)*parseFloat(num2); 
 document.calc.result.value=total; 
 }
 function calcu4() {
 var num1=document.calc.num1.value;
 var num2=document.calc.num2.value;
 if (num2==0){ alert("除数不能为0,请重新输入");
  }else{
 var total = num1+"/"+num2+"="+parseFloat(num1) / parseFloat(num2); 
 document.calc.result.value=total; 
 }
 }
</script>
</body>

</html>

运行结果：