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知识点：
v-model双向绑定
v-on事件绑定
实现效果
源码
<!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>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>
var vm = new Vue({
el: '#app',
data: {
n1: 0,
n2: 0,
opt: '+',
result: 0
},
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 '/':
this.result = parseInt(this.n1) / parseInt(this.n2)
break
default:
this.result = 0
}
}
}
})
</script>
</body>
</html>