计算结果无法显示

来源：2-11 自由编程

最甜的冰

2021-12-04 10:55:59

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <script src="./lib/vue3.0.js"></script>
  </head>
  <body>
    <div id="app">
      <input type="text" v-model="num1" />
      <select v-model="opt">
        <option value="+">+</option>
        <option value="-">-</option>
        <option value="*">x</option>
        <option value="/">÷</option>
      </select>
      <input type="text" v-model="num2" />
      <button @click="cal">=</button>
      <span v-text="result"></span>
    </div>

    <script>
      const app = {
          data () {
              return {
                num1:'',
                num2:'',
                opt:"+",
                result:''
              }
          },
        cal() {
          switch (this.opt) {
            case "+":
              this.result = parseFloat(this.num1) + parseFloat(this.num2);
              break;
            case "-":
              this.result = parseFloat(this.num1) - parseFloat(this.num2);
              break;
            case "*":
              this.result = parseFloat(this.num1) * parseFloat(this.num2);
              break;
            case "/":
              this.result = parseFloat(this.num1) / parseFloat(this.num2);
              break;
          }
        },
      };
      Vue.createApp(app).mount('#app');
    </script>
  </body>
</html>

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