首先要导入vue的包，利用v-model的数据双向绑定实现
代码:
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>简易版计算器</title>
<script src="lib/vue.js"></script>
</head>
<body>
<div id="app">
<input type="text" v-model="n1"/>
<select name="" id="" 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 '/':
this.result=parseInt(this.n1)/parseInt(this.n2)
break;
}
// 写法二： 投机取巧的
/* var codeStr='parseInt(this.n1)'+this.opt+'parseInt(this.n2)'
this.result=eval(codeStr) */
}
}
})
</script>
</body>
</html>