<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <div id="app"> <input type="text" v-model="a" @change="calc"> <select v-model="opt" @change="calc"> <option value="+">+</option> <option value="-">-</option> <option value="*">*</option> <option value="/">/</option> </select> <input type="text" v-model="b" @change="calc"> <button @click="calc">=</button> <input type="text" v-model="ans"> </div> </body> <script src="../JS/Vue.js"></script> <script> let app = new Vue({ el: ‘#app‘, data: { a: 0, b: 0, ans: 0, opt: ‘+‘, }, methods: { calc() { switch (this.opt) { case "+": this.ans = parseInt(this.a) + parseInt(this.b); break; case "-": this.ans = parseInt(this.a) - parseInt(this.b); break; case "*": this.ans = parseInt(this.a) * parseInt(this.b); break; case "/": this.ans = parseInt(this.a) / parseInt(this.b); break; } } } }) </script> </html>
原文：https://www.cnblogs.com/Yuigahama-Yui/p/13644096.html