<div id="app" class="container" >
 <h3>{{title}}：</h3>
 <ul class="form-group" style="max-height: 300px;overflow: auto;">
 <li class="list-group-item row" v-for="(item,index) in search" :key="item.id">
  <span class='col-sm-1' >{{item.nikename}}：</span>
  <span class='col-sm-5'>{{item.content}}</span>
  <span class='col-sm-2'>{{item.date}}</span>
  <button class='col-sm-2 btn btn-danger' type="button" @click="del(index,item.id)">删除</button>
  <button class='col-sm-2 btn btn-info' type="button" @click="checkPre(index,item.id)">修改</button>
 </li>
 </ul>
 <br><br><br>
 <form class="form-horizontal" v-show="bl">
 <div class="form-group">
  <label for="search" class="col-sm-1 control-label">搜索</label>
  <div class="col-sm-11">
  <input type="text" class="form-control" id="search" placeholder="搜索留言" v-model="query" >
  </div>
 </div>
 <div class="form-group">
  <label for="nikename" class="col-sm-1 control-label">昵称</label>
  <div class="col-sm-11">
  <input type="text" class="form-control" id="nikename" placeholder="请输入昵称" v-model="nikename">
  </div>
  </div>
  <div class="form-group">
 <label for="content" class="col-sm-1 control-label">内容</label>
 <div class="col-sm-11">
  <textarea id="content" class="form-control" rows="3" v-model="content"></textarea>
 </div>
  </div>
  <button type="button" class="btn btn-success col-sm-1 col-sm-push-9" @click="add" >发表</button>
  <button type="button" class="btn btn-danger col-sm-1 col-sm-push-10" @click="clear" >清屏</button>
 </form> 
 <form class="form-horizontal" v-show="!bl">
  <div class="form-group">
 <label class="col-sm-1 control-label">修改：</label>
 <div class="col-sm-11">
  <textarea class="form-control" rows="3" v-model="changeContent"></textarea>
 </div>
  </div>
  <button type="button" class="btn btn-success col-sm-1 col-sm-push-11" @click="confirm">确认修改</button>
 </form> 
</div>

data:{
 title:'留言板',
 nikename:'',
 content:'',
 date:'',
 query:'',//查询的内容
 changeContent:'',//修改后的数据
 bl:true,
 list:[
 {id:1,nikename:"笑话",content:'今天天气真好',date:'2020-02-27-18:06'},
 {id:2,nikename:"小草",content:'是呀，那咱们出去晒太阳吧',date:'2020-02-26-18:06'}
 ]
 },

add() {
 this.list.push({
  id: this.list.length + 1,
  nikename: this.nikename,
  content: this.content,
 date:this.getdate()
 })
 this.nikename='';
 this.content='';
 },

del(index,id){
 this.list.splice(index,1)
 }
clear(){
 this.list = [];//不可直接将数组长度设为零,这是非响应式的操作
 },

checkPre(index,id){
 this.bl = !this.bl;
 this.nikename = this.list[index].nikename;
},
confirm(){
 this.list.forEach(function(item,index){
 if(item.nikename == vm.nikename){
 item.content = vm.changeContent;
 item.date = vm.getdate();
 }
 })
 this.bl = !this.bl;
 vm.nikename='';
},

computed:{
 search(){
 let result = [];
 this.list.forEach((item,index)=>{
 if(item.nikename.includes(this.query) || item.content.includes(this.query)){
 result.push(item)
 }
 })
 return result;
 },
},