<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width,initial-scale=1.0"> <meta http-equiv="X_UA-Compatible" content="ie=edge"> <title>vue 入门</title> <!--1 导入vue.js库--> <script src="./lib/vue.js"></script> </head> <body> <div id="app"> <h3>简易计算器</h3> <input type="text" v-model="n1"> <select v-model="opt"> <option value="+">+</option> <option value="-">-</option> <option value="*">*</option> <option value="/">/</option> </select> <input type="text" v-model="n2"> <input type="button" value="=" @click="calc"> <input type="text" v-model="result"> </div> <script> var vm = new Vue({ el: '#app', data: { n1: 0, n2: 0, result: 0, opt: '+' }, methods: { calc() { /* switch (this.opt) { case '+': this.result = parseInt(this.n1) + parseInt(this.n2); break; case '-': this.result = parseInt(this.n1) - parseInt(this.n2); break; case '*': this.result = parseInt(this.n1) * parseInt(this.n2); break; case '/': if (this.n2 == 0) { alert('被除数不能为零!'); return; } this.result = parseInt(this.n1) / parseInt(this.n2); break; }*/ var codeStr = "parseInt(this.n1) "+this.opt+" parseInt(this.n2)" this.result = eval(codeStr); } } }) </script> </body> </html>