vue简易计算器

<!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>
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