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39.组件案例-评论列表.html
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39.组件案例-评论列表.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>
<link rel="stylesheet" href="./lib/bootstrap.css">
</head>
<body>
<div id="app">
<comment-box @update="loadComments">
</comment-box>
<ul class="list-group">
<li class="list-group-item" v-for="item in list" :key="item.id">
<span class="badge">评论人:{{ item.user }}</span>
{{ item.content }}
</li>
</ul>
</div>
<template id='temp1' >
<div>
<div class="form-group">
<label>评论人：</label>
<input type="text" class="form-control" v-model="user">
</div>
<div class="form-group">
<label>评论内容：</label>
<textarea class="form-control" v-model="content"></textarea>
</div>
<div class="form-group" >
<input type="button" value="发表评论" class="btn btn-primary" @click="postComment">
</div>
</div>
</template>
<script>
var commentBox = {
template: '#temp1',
data(){
return {
user: '',
content: ''
}
},
methods: {
postComment(){
/*
1.评论数据村到哪里去？？？ 存放到了localStorage中
2.先组织出一个最新的评论数据对象
3.把第二步中得到的评论对象保存到localStorage中
3.1 localStorage中只支持存放字符串数据, 要先调用JSON.stringfy
3.2 在保存最新的评论数据之前，要从localStorage获取之前的评论数据。转化为一个数组对象。然后吧最新的数据push进去
3.3 如果获取到的localStorage中的评论字符串为空，则可以返回一个'[]'让JSON.parse去转换
3.4 把最新评论列表数组再次调用JSON.stringfy 转化为 数组字符串然后调用localStringfy。
*/
var comment = {id: Date.now(), user: this.user, content: this.content}
var list = JSON.parse(localStorage.getItem('cmts' || '[]'))
list.unshift(comment)
localStorage.setItem('cmts', JSON.stringify(list))
this.user = this.content = ''
this.$emit('update')
}
},
}
var vm = new Vue({
el: '#app',
data: {
list: [
{id: Date.now(), user:'李白', content: '天生我才必有用'},
{id: Date.now(), user:'林则徐', content:'岂因祸福避趋之'},
{id: Date.now(), user:'蛤', content:'苟利国家生死以'}
]
},
created() {
this.loadComments()
},
methods: {
loadComments(){
var list = JSON.parse(localStorage.getItem('cmts' || '[]'))
this.list = list
}
},
components:{
'comment-box':commentBox
}
})
</script>
</body>
</html>