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VueDemoCalculator.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Vue demo 简易计算器</title>
<style>
</style>
</head>
<body>
<div id="div1">
<input type="text" value="" v-model="n1">
<select name="myselect" v-model="opt">
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select>
<input type="text" value="" v-model="n2">
<input type="button" value="=" @click="calc()">
<input type="text" value="" v-model="result">
</div>
<!-- 先引入 Vue 【https://unpkg.com/[email protected]/dist/vue.js】 -->
<script src="https://unpkg.com/vue/dist/vue.js"></script>
<script>
var vm = new Vue({
el: "#div1",
data: {
n1: 0,
n2: 0,
result: 0,
opt: "+"
},
methods: {
calc() {
//（======第一种写法 === === === =）
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;
}
// （第二种写法，投机取巧的方法，正常开发中最好少用）
// var codeStr = parseInt(this.n1) + this.opt + parseInt(this.n2);
// this.result = eval(codeStr);
}
}
})
</script>
</body>
</html>