v-model实现数据的双向绑定（简易计算器实例）
简易计算器实例
<!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>简易计算器</title>
<script src="../lib/vue.js"></script>
</head>
<body>
<div class="app">
<input type="text" v-model="firstNum">
<select name="" id="" v-model="symbol">
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select>
<input type="text" v-model="secondNum">
<input type="button" value="=" @click="count">
<input type="text" v-model="finallyNum">
</div>
<!-- 简易计算器基本html结构 -->
<script>
var vm = new Vue({
el:'.app',
data:{
firstNum:'',
secondNum:'',
finallyNum:'',
symbol:'+' //v-model双向数据绑定初始化值
},
methods:{
count(){
if(this.symbol=='+'){
this.finallyNum=parseInt(this.firstNum)+parseInt(this.secondNum);
}
if(this.symbol=='*'){
this.finallyNum=parseInt(this.firstNum)*parseInt(this.secondNum);
}
if(this.symbol=='-'){
this.finallyNum=parseInt(this.firstNum)-parseInt(this.secondNum);
}
if(this.symbol=='/'){
this.finallyNum=parseInt(this.firstNum)/parseInt(this.secondNum);
}
} //定义计算方法
}
})
</script>
</body>
</html>
