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JS简单计算器
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  1. <!DOCTYPE html>
  2. <html>
  3.     <head>
  4.         <meta charset="utf-8" />
  5.         <meta name="viewport" content="width=device-width, initial-scale=1">
  6.         <title>简单计算器</title>
  7.     </head>
  8.     <body>
  9.         <input type="text" name="" id="num1" value="" />
  10.         <select name="" id="method">
  11.             <option value="+" selected="selected">+</option>
  12.             <option value="-">-</option>
  13.             <option value="*">*</option>
  14.             <option value="/">/</option>
  15.             <option value="%">%</option>
  16.         </select>
  17.         <input type="text" name="" id="num2" value="" />
  18.         <input type="button" name="" id="calc" value="计算" />
  19.         <div class="" id="result">
  21.         </div>
  22.         <script type="text/javascript">
  23.             document.getElementById('calc').onclick = function(){
  24.                 var num1 = document.getElementById('num1').value;
  25.                 var num2 = document.getElementById('num2').value;
  26.                 var method = document.getElementById('method').value;
  27.                 var res = 0;
  28.                 num1=parseFloat(num1);
  29.                 num2=parseFloat(num2);
  30.                 if(isNaN(num1)){
  31.                     document.getElementById('result').innerHTML = '第一个数不是数字';
  32.                     return;
  33.                 }
  34.                 if(isNaN(num2)){
  35.                     document.getElementById('result').innerHTML = '第二个数不是数字';
  36.                     return;
  37.                 }
  39.                 switch(method){
  40.                     case '+' :
  41.                         res = num1 + num2;
  42.                         document.getElementById('result').innerHTML = '运算结果：'+ num1 + '+' + num2 + '=' + res;
  43.                         break;
  44.                     case '-' :
  45.                         res = num1 - num2;
  46.                         document.getElementById('result').innerHTML = '运算结果：'+ num1 + '-' + num2 + '=' + res;
  47.                         break;
  48.                     case '*' :
  49.                         res = num1 * num2;
  50.                         document.getElementById('result').innerHTML = '运算结果：'+ num1 + '*' + num2 + '=' + res;
  51.                         break;
  52.                     case '/' :
  53.                         if(num2 == 0){
  54.                             document.getElementById('result').innerHTML = '除数不能为0';
  55.                             return;
  56.                         }                    
  57.                         res = num1 / num2;
  58.                         document.getElementById('result').innerHTML = '运算结果：'+ num1 + '/' + num2 + '=' + res;
  59.                         break;
  60.                     case '%' :
  61.                         if(num2 == 0){
  62.                             document.getElementById('result').innerHTML = '除数不能为0';
  63.                             return;
  64.                         }                    
  65.                         res = num1 % num2;
  66.                         document.getElementById('result').innerHTML = '运算结果：'+ num1 + '%' + num2 + '=' + res;
  67.                         break;
  68.                 }
  71.             }
  73.         </script>
  74.     </body>
  75. </html>
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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