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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>if和show</title>
<script src="../../vue/vue.js"></script>
</head>
<body>
<div id="app">
<input type="button" value="toggle" @click="flag = !flag">
<!-- 每次切换都会重新创建或删除元素;
有较高的切换性能消耗
-->
<h3 v-if="flag">这是v-if控制的元素</h3>
<!-- 每次切换都只是添加或删除 display: none;
有较高的初始化性能消耗
-->
<h3 v-show="flag">这是v-show控制的元素</h3>
</div>
</body>
<script>
var vm = new Vue({
el: '#app',
data: {
flag: true
}
});
</script>
</html>
