文章目录
简易计算器案例

1. HTML 代码结构
<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>
2. Vue实例代码:
// 创建 Vue 实例,得到 ViewModel
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:
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;
}
// 注意:这是投机取巧的方式,正式开发中,尽量少用
// var codeStr = 'parseInt(this.n1) ' + this.opt + ' parseInt(this.n2)'
// this.result = eval(codeStr)
}
}
});
3. 全部代码
<!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-2.4.0.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> // 创建 Vue 实例,得到 ViewModel 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: 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) breakvalue_name: value, case '/': this.result = parseInt(this.n1) / parseInt(this.n2) break; } // 注意:这是投机取巧的方式,正式开发中,尽量少用 // var codeStr = 'parseInt(this.n1) ' + this.opt + ' parseInt(this.n2)' // this.result = eval(codeStr) } } }); </script>
</body>
</html>
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