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JavaScript简单计算器
坨坨
Original
428 people have browsed it
  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <title>简单计算器</title>
  6. </head>
  7. <body>
  8. <div>
  9.     <input type="text" id="num1" value="">
  10.     <select id="yunsuanfu">
  11.         <option value="请选择">请选择</option>
  12.         <option value="+">+</option>
  13.         <option value="-">-</option>
  14.         <option value="*">*</option>
  15.         <option value="/">/</option>
  16.         <option value="%">%</option>
  17.     </select>
  18.     <input type="text" id="num2" value="">
  19.     <button id="count">
  20.         计算
  21.     </button>
  22.     <p id="jieguo"></p>
  23. </div>
  24. </body>
  25. <script>
  27.     var count = document.getElementById('count');
  29.     count.onclick = function(){
  31.         var num1 =document.getElementById('num1').value;
  32.         var num2 =document.getElementById('num2').value;
  33.         var yunsuanfu =document.getElementById('yunsuanfu').value
  34.         var re = /^[0-9]+.?[0-9]*/;
  36.         if (num1 =='' || num2 ==''){
  37.             document.getElementById('jieguo').innerHTML= '错误：计算不能为空'
  38.         }
  39.         else if(num2 == 0 && (yunsuanfu =='/' || yunsuanfu == '%')){
  40.             document.getElementById('jieguo').innerHTML= '错误：被除数不能为0'
  41.         }
  42.         else if(!re.test(num1) || !re.test(num2)){
  43.             document.getElementById('jieguo').innerHTML= '错误：只能填写数字进行计算'
  44.         }
  45.         else {
  46.             num1 = parseFloat(num1);
  47.             num2 = parseFloat(num2);
  48.             console.log(num1)
  49.             console.log(num2)
  50.             if(yunsuanfu == '请选择'){
  51.                 document.getElementById('jieguo').innerHTML='请选择运算符';
  52.             }
  53.             if(yunsuanfu == '+'){
  54.                 document.getElementById('jieguo').innerHTML=num1+'+'+num2+'='+(num1+num2);
  55.             }
  56.             if(yunsuanfu == '-'){
  57.                 document.getElementById('jieguo').innerHTML=num1+'-'+num2+'='+(num1-num2);
  58.             }
  59.             if(yunsuanfu == '*'){
  60.                 document.getElementById('jieguo').innerHTML=num1+'*'+num2+'='+(num1*num2);
  61.             }
  62.             if(yunsuanfu == '/'){
  63.                 document.getElementById('jieguo').innerHTML=num1+'除'+num2+'='+(num1/num2);
  64.             }
  65.             if(yunsuanfu == '%'){
  66.                 document.getElementById('jieguo').innerHTML=num1+'取余'+num2+'='+(num1%num2);
  67.             }
  69.         }
  71.     }
  73. </script>
  74. </html>
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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