vue.js（6）--v-model

v-model实现数据的双向绑定（简易计算器实例）

简易计算器实例

<!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>简易计算器</title>
    <script src="../lib/vue.js"></script>
</head>
<body>
    <div class="app">
        <input type="text" v-model="firstNum">
        <select name="" id="" v-model="symbol">
            <option value="+">+</option>
            <option value="-">-</option>
            <option value="*">*</option>
            <option value="/">/</option>
        </select>
        <input type="text" v-model="secondNum">
        <input type="button" value="=" @click="count">
        <input type="text" v-model="finallyNum">
    </div>
    <!-- 简易计算器基本html结构 -->
    <script>
        var vm = new Vue({
            el:'.app',
            data:{
                firstNum:'',
                secondNum:'',
                finallyNum:'',
                symbol:'+'  //v-model双向数据绑定初始化值
            },
            methods:{
                count(){
                    if(this.symbol=='+'){
                        this.finallyNum=parseInt(this.firstNum)+parseInt(this.secondNum);
                    }
                    if(this.symbol=='*'){
                        this.finallyNum=parseInt(this.firstNum)*parseInt(this.secondNum);
                    }
                    if(this.symbol=='-'){
                        this.finallyNum=parseInt(this.firstNum)-parseInt(this.secondNum);
                    }
                    if(this.symbol=='/'){
                        this.finallyNum=parseInt(this.firstNum)/parseInt(this.secondNum);
                    }
                }  //定义计算方法
            }
        })
    </script>
</body>
</html>

 

posted @ 2019-08-12 20:03  齐齐怪  阅读(184)  评论(0)    收藏  举报