1 简易计算器
<!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.js"></script>
</head>
<body>
<div id="app" v-model="opt">
<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(){
/*
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:
break;
*/
//正式项目不推荐下面的写法
var codeStr='parseInt(this.n1)' + this.opt + 'parseInt(this.n2)'
this.result =eval(codeStr)
}
}
}
)
</script>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
