VUE small case - simple calculator

This small case mainly when practicing using the v-model, the function is not perfect
<!DOCTYPE html>
<html lang="zh-CN">
<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>Document</title>
    <script src="./lib/vue-2.4.0.js"></script>
</head>
<body>
    <div id="app">
        <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>
        // 创建 Vue 实例，得到 ViewModel
        var vm = new Vue({
            el: '#app',
            Data: { 
                N1: 0 , 
                N2: 0 , 
                Result: 0 , 
                opt: ' + ' 
            }, 
            Methods: { 
                Calc () { // method of arithmetic calculator 
                    @ logic: 
                    Switch ( the this .opt) {
                         Case  ' + ' :
                             the this .Result = the parseInt ( the this .n1) + the parseInt ( the this.n2);
                            break;
                        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;
                    }
                }
            }
        });
    </script>
</body>
</html>
VUE small case - simple calculator

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