effect:
code show as below:
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <script type="text/javascript" src="js/vue.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="*">*</option> <option value="/">/</option> </select> <input type="text" v-model="num2" /> <button @click="getResult" >=</button> <input type="text" v-model="res" /> </div> <script type="text/javascript"> var vm = new Vue({ el:"#app", data:{ num1:0, num2:0, opt:'+', res:0 }, Methods: { the getResult () { the console.log ( the this .opt) var STR = ' Number The (this.num1) ' + the this .opt + ' Number The (this.num2) ' // the eval function can be performed as the parameter code to perform the this .res = the eval (STR) } } }) </ Script > </ body > </ HTML >