Vue.js双向绑定练习-简易计算器

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script src="vue.js" type="text/javascript" charset="utf-8"></script>
</head>
<div id="app">
<p>{{msg}}</p>
<input type="text" name="" id="" value="" v-model="num1"/>
<select v-model="calsymbol">
<option value ="+">+</option>
<option value ="-">-</option>
<option value ="*">*</option>
<option value ="/">/</option>
</select>
<input type="text" name="" id="" value=""v-model="num2" />
<input type="button" name="" id="" value="=" @click="cal"/>
<input type="text" name="" id="" value="" v-model="result"/>
</div>
<script type="text/javascript">
var vm=new Vue({
el:"#app",
data:{
msg:"请输入你想计算的数字",
num1:0,
num2:0,
result:0,
calsymbol:'+'
},
methods:{
cal(){
this.result=eval('parseInt(this.num1)'+this.calsymbol+'parseInt(this.num2)')
}
}
})
</script>
<body>
</body>
</html>

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