
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 ViewModelvar 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 ViewModelvar 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>