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简单计算器
天长地久的博客
Original
513 people have browsed it

<!DOCTYPE html>

<html lang="zh-CN">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
</head>
<body>
<fieldset onload="init()">
<legend>小小计算器</legend>
<input type="number" name="n1" id="n1" value="0" oninput="calcu()" />
<select name="" id="opt" oninput="calcu()">
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select>
<input type="number" name="n2" id="n2" value="0" oninput="calcu()" />
<span>=</span>
<span class="res">0</span>
</fieldset>
<script>
const n1 = document.querySelector(“#n1”);
const n2 = document.querySelector(“#n2”);
const opt = document.querySelector(“#opt”);

  1.   function init() {
  2.     n1.value = 0;
  3.     n2.value = 0;
  4.     opt.value = "+";
  5.   }
  7.   function calcu() {
  8.     let value1 = n1.value * 1;
  9.     let value2 = n2.value * 1;
  10.     let optType = opt.value;
  11.     let res = 0;
  12.     switch (optType) {
  13.       case "+":
  14.         res = value1 + value2;
  15.         break;
  16.       case "-":
  17.         res = value1 - value2;
  18.         break;
  19.       case "*":
  20.         res = value1 * value2;
  21.         break;
  22.       case "/":
  23.         if (value2 === 0) throw "除数不能为零";
  24.         res = (value1 / value2).toFixed(2);
  25.         break;
  26.       default:
  27.         throw "非法操作";
  28.     }
  29.     document.querySelector(".res").textContent = res;
  30.   }
  31. </script>

</body>
</html>

Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：makedown语法还是得熟悉一下
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