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老师批语：
jQuery实现说说输入点赞删除功能，主要运用jQuery选择器，append()，val()，text()，remove()
<!DOCTYPE html>
<html>
<head>
<title>评论功能练习</title>
<meta charset="utf-8">
<link rel="icon" type="image/x-icon" href="static/images/logo.png">
<link rel="stylesheet" type="text/css" href="static/style.css">
<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<style>
body { font-size: 12px; line-height: 120%; text-align: center; color:#333; padding: 20px;}
a { color: #333; text-decoration: none;}
a:hover { text-decoration: underline;}
* { margin: 0; padding: 0; border: none;}
.clearfix:after { content:"."; display:block; height:0; clear:both; visibility:hidden}
.clearfix { *height:1%;}
#list { margin: 0 auto; text-align: left; width: 540px;}
.box { border-top: 1px solid #eee; position: relative; width: 540px; padding: 20px 0}
.box:hover .close { display: block;}
.close { display: none; top:0px; right: 0px; width: 28px; height: 28px; border: 1px solid #eee; position: absolute; background: #f2f4f7; line-height: 27px; text-align: center;}
.close:hover { background: #c8d2e2; text-decoration: none;}
.head { float: left; width: 50px; height:50px; margin-right: 10px;border-radius:25px;}
.content { float: left; width: 440px;}
.main { margin-bottom: 10px;}
.txt { margin-bottom: 10px;}
.user { color: #369; }
.pic { margin-right: 5px; width: 200px; border: 1px solid #eee;}
.info { height: 20px; line-height: 19px; font-size: 12px; margin: 0 0 10px 0;}
.info .time { color: #ccc; float: left; height: 20px; padding-left: 20px; background: url("./images/bg1.jpg") no-repeat left top;}
.info .praise { color: #369; float: right; height: 20px; padding-left: 18px; background: url("./images/bg2.jpg") no-repeat left top;}
.praise_2{background: url("./images/bg3.jpg") no-repeat left top;color: #369; float: right; height: 20px; padding-left: 18px;}
.praises-total { margin: 0 0 10px 0; height: 20px; background: url("./images/praise.png") no-repeat 5px 5px rgb(247, 247, 247); padding: 5px 0 5px 25px; line-height: 19px;}
.comment-box { padding: 10px 0; border-top: 1px solid #eee;}
.comment-box:hover { background: rgb(247, 247, 247);}
.comment-box .myhead { float: left; width: 30px; height: 30px; margin-right: 10px;border-radius:15px; }
.comment-box .comment-content { float: left; width: 400px; }
.comment-box .comment-content .comment-time { color: #ccc; margin-top: 3px; line-height: 16px; position: relative;}
.comment-box .comment-content .comment-praise { display: none; color: #369; padding-left: 17px; height: 20px; background: url("./images/praise.png") no-repeat; position: absolute; bottom: 0px; right: 44px;}
.comment-box .comment-content .comment-operate { display: none; color: #369; height: 20px; position: absolute; bottom: 0px; right: 10px;}
.comment-box .comment-content:hover .comment-praise { display: inline-block;}
.comment-box .comment-content:hover .comment-operate { display: inline-block;}
.text-box .comment { border: 1px solid #eee; display: block; height: 15px; width: 428px; padding: 5px; resize: none; color: #ccc}
.text-box .btn { font-size: 12px; font-weight: bold;float: right; width: 65px; height: 25px; border: 1px solid #0C528D; color: #fff; background: #4679AC;}
.text-box .btn-off { border: 1px solid #ccc; color: #ccc; background: #F7F7F7;}
.text-box .word{ float: right; margin: 7px 10px 0 0; color: #666;}
.text-box-on .comment{ height: 50px; color: #333;}
.text-box-on .btn{ display: inline;}
.text-box-on .word{ display: inline;}
</style>
</head>
<body>
<div id="list">
<div class="box clearfix">
<!-- 删除说说按钮 close-->
<a class="close" href="javascript:;">×</a>
<img class="head" src="static/images/1.png" alt="">
<div class="content">
<div class="main">
<p class="txt">
<span class="user">西门大官人: </span>
~ All the luck is for you. ~
</p>
<img class="pic" src="static/images/img1.jpg" alt="">
</div>
<div class="info clearfix">
<span class="time">02-14 23:01</span>
<!-- 给说说点赞 praise -->
<a class="praise" href="javascript:;">赞</a>
</div>
<div class="praises-total" total="4" style="display: block;"><b>4</b>个人觉得很赞</div>
<!--评论内容-->
<div class="comment-list">
<!-- 每次评论要添加的内容跟标签 -->
<div class="comment-box clearfix" user="self">
<img class="myhead" src="static/images/4.jpg" alt="">
<div class="comment-content">
<p class="comment-text"><span class="user">我:</span>你说的都对……</p>
<p class="comment-time">
2019-01-19 14:36
<a href="javascript:;" class="comment-praise" total="1" my="0" style="display: inline-block"><b>1</b>赞</a>
<a href="javascript:;" class="comment-operate">删除</a>
</p>
</div>
</div>
<!--添加结束-->
</div>
<!--评论内容结束-->
<div class="text-box">
<textarea class="comment" placeholder="评论…"></textarea>
<button class="btn">回 复</button>
<span class="word"><span class="length">0</span>/140</span>
</div>
</div>
</div>
<div class="box clearfix">
<a class="close" href="javascript:;">×</a>
<img class="head" src="static/images/2.jpg" alt=""/>
<div class="content">
<div class="main">
<p class="txt">
<span class="user">欧阳克 : </span>三亚的海滩很漂亮。
</p>
<img class="pic" src="static/images/img5.jpg" alt=""/>
</div>
<div class="info clearfix">
<span class="time">02-14 23:01</span>
<a class="praise" href="javascript:;">赞</a>
</div>
<div class="praises-total" total="0" style="display: none;"></div>
<div class="comment-list">
<div class="comment-box clearfix" user="other">
<img class="myhead" src="static/images/3.png" alt="">
<div class="comment-content">
<p class="comment-text"><span class="user">韦小宝：</span>我也想去三亚。</p>
<p class="comment-time">
2019-01-19 14:36
<a href="javascript:;" class="comment-praise" total="0" my="0"><b></b>赞</a>
<a href="javascript:;" class="comment-operate">删除</a>
</p>
</div>
</div>
</div>
<div class="text-box">
<textarea class="comment" placeholder="评论…"></textarea>
<button class="btn">回 复</button>
<span class="word"><span class="length">0</span>/140</span>
</div>
</div>
</div>
</div>
<script>
$(function () {
// on() 事件绑定
$('.comment').on('keyup',function () {
let len = $(this).val().length;//内容字符长度
$(this).parent('.text-box').find('.length').text(140-len);
});
// 文档中所有的 .btn 绑定事件
$(document).on('click','.btn',function () {
let val = $(this).prev().val(); //获取评论内容
if (val === ''){
alert('留言内容不能为空！');
} else {
let date = new Date();
let time = date.getFullYear()+'-'+(date.getMonth()+1)+'-'+date.getDate()+' '+date.getHours()+":"+date.getMinutes()+':'+date.getSeconds();
let html = '<div class="comment-box clearfix" user="self">' +
'<img class="myhead" src="static/images/4.jpg" alt="">' +
'<div class="comment-content">' +
'<p class="comment-text"><span class="user">我:</span>'+val+'</p>' +
'<p class="comment-time">'+time+
'<a href="javascript:;" class="comment-praise" total="1" my="0" style="display: inline-block">1赞</a>' +
'<a href="javascript:;" class="comment-operate">删除</a></p></div></div>';
$(this).parents('.box').find('.comment-list').append(html); // 动态添加评论
$(this).parents('.box').find('.comment').val(''); //清空内容
$(this).parents('.box').find('.length').val('0'); //清空数量
//输入完成时 文本框恢复高度
$(this).prev().height(20);
}
});
//输入评论内容 文本框高度增加
$('.comment').click(function () {
$(this).height(80);
});
// 评论删除
$('#list').on('click','.comment-operate',function () {
if (confirm('确认删除吗？')){
$(this).parents('.comment-box').remove(); //删除 comment-box
}else {
return false;
}
});
//说说删除
$('.close').on('click',function () {
if (confirm('确认删除吗？')){
$(this).parents('.box').remove(); //删除 box
}else {
return false;
}
});
//说说点赞和取消功能
$('.praise').on('click',function () {
//获取点赞数量
let num = $('.praises-total').children('b').text();
if ($(this).hasClass('clicked')){ //如果点击过了就取消
num--;
$('.praises-total').children('b').text(num);
$(this).text('赞');
$(this).attr('class','praise');
} else { //否则就自增1
num++;
$('.praises-total').children('b').text(num);
$(this).text('取消');
$(this).attr('class','praise_2'); //替换点赞样式
$(this).addClass('clicked'); //添加新的class样式
}
});
// 评论点赞
$('#list').one('click','.comment-praise',function (){
//获取点赞数量
let num = parseInt($('.comment-praise').children('b').text());
let praise = $('.comment-praise');
num++; //点赞数量加一
praise.html('<b>'+num+'</b>'+'赞'); //点赞数量写入
});
})
</script>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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