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11.v-if和v-show的使用和特点.html
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11.v-if和v-show的使用和特点.html
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<!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.js"></script>
</head>
<body>
<div id="app">
<input type="button" value="Button" @click="toggle()">
<br>
v-if的特点：每次都会重新创建或创建元素
<br>
v-show的特点：每次不会重新进行DOM的删除和创建操作，只是切换了元素的display:none
<br>
v-if有较高的切换性能消耗，如果元素涉及到频繁的切换，最好不要用v-if
v-show有较高的初始渲染消耗，如果元素可能永远不用显示出来被用户看到
<h3 v-if="flag">This element is controlled by v-if</h3>
<h3 v-show="flag">This element is controlled by v-show</h3>
</div>
<script>
var vm = new Vue({
el:'#app',
data:{
flag: true,
},
methods: {
toggle(){
this.flag=!this.flag
}
},
})
</script>
</body>
</html>