<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<style>
.box{
width: 100px;
height: 100px;
background-color: aqua;
}
</style>
</head>
<body>
<div id="app">
<button class="btn" type="button" @click="bool = !bool">显示/隐藏</button>
<!-- <div class="box" v-if="bool"> -->
<div class="box" v-show="bool"></div>
</div>
<script type="text/javascript">
new Vue({
el:‘#app‘,
data:{
bool:true
}
})
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<style>
li{
width: 100px;
margin: 10px;
}
li.active{
background-color: #FFFF00;
}
</style>
</head>
<body>
<div id="app">
<ul>
<li v-for="(item,key) in titles" :key="key" :class="{active:index==key}" @click="run(key)">
{{item}}--{{key}}
</li>
</ul>
</div>
<script>
new Vue({
el:‘#app‘,
data:{
titles:[‘历史‘,‘旅游‘,‘娱乐‘,‘电影‘],
index:0
},
methods:{
run(key){
this.index = key
}
}
})
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
<div id="app">
<!-- num1 -->
<input type="text" class="num1" v-model="num1">
<!-- op -->
<select class="op" v-model="op">
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select>
<!-- num2 -->
<input type="text" class="num2" v-model="num2">
<!-- = -->
<button @click="run">=</button>
<!-- res -->
<input type="text" class="res" v-model="res">
</div>
<script>
new Vue({
el:‘#app‘,
data:{
num1:0,
num2:0,
res:0,
op:‘+‘
},
methods:{
run(){
this.res = eval(parseFloat(this.num1)+this.op+parseFloat(this.num2))
}
}
})
</script>
</body>
</html>
原文：https://www.cnblogs.com/shellxx/p/13347425.html