简易计算器案例很简陋，目的是为了加深学习v-model 数据双向绑定
第一种写法
<!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="./vue.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,
result: 0,
opt:'+'
},
methods:{
calc(){//计算器算数的方法
//逻辑:
//拿到n1,opt,n2值,this.result值计算
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;
}
}
}
})
</script>
</body>
</html>
第二种有点投机取巧，正式开发中，最好不要这样操作
<!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="./vue.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,
result: 0,
opt:'+'
},
methods:{
calc(){//计算器算数的方法
//逻辑:
//拿到n1,opt,n2值,this.result值计算
var codeStr = 'parseInt(this.n1) ' + this.opt + ' parseInt(this.n2)'
this.result= eval(codeStr)
}
}
})
</script>
</body>
</html>