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jQuery基础学习3---五期线上学习班
风行的博客
Original
478 people have browsed it

1操作属性

attr( )返回备选元素的属性值  *必须是自带属性

removeAttr( )从被选元素中移除属性

2添加元素

  • 从内部添加

    append( )在被选元素的末尾插入内容

    prepend( )在被选元素的开头插入内容

  • 从外部添加

    after( )被选元素之后插入内容

    before( )被选元素之前插入内容

3删除元素

       remove( )删除被选元素及其子元素

       empty( )删除被选元素的子元素

2实例 微博说说评论点赞功能

心得:this的使用,on( )方法

实例

<!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 type="text/javascript" src="static/jquery-3.3.1.min.js"></script>
</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/11.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;">4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/44.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">1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/22.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/33.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">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 type="text/javascript">
  $(function(){
    $('.comment').on('keyup',function(){//绑定事件,动态绑定
      var len=$(this).val().length;
      $(this).parents('.text-box').find('.length').text(140-len);
    })
    $(document).on('click','.btn',function(){ //点击回复按钮
      var val=$(this).prev().val();  //遍历方法 获取元素紧邻前一个同胞元素;
      if(val!=''){
        var date=new Date();
        var y=date.getFullYear()+'-'+(date.getMonth()+1)+'-'+date.getDate()+'  '+date.getHours()+'-'+date.getMinutes()+'-'+date.getSeconds();
        var html='<div class="comment-box clearfix" user="self"><img class="myhead" src="static/images/44.jpg" alt=""><div class="comment-content"><p class="comment-text"><span class="user">我:</span>'+val+'你说的都对……</p><p class="comment-time">'+y+'<a href="javascript:;" class="comment-praise" total="0" my="0" style="display: inline-block">赞</a><a href="javascript:;" class="comment-operate">删除</a></p></div></div>';

        //添加评论    
        $(this).parents('.box').find('.comment-list').append(html); 
        //清空输入框
        $(this).parents('.box').find('.comment').val("");
        //初始化输入字数
        $(this).parents('.box').find('.length').text("0");
        $(this).prev().height(20); 

      }

    })
    //动态删除
    // $('.comment-operate').on('click',function(){
    //     if (confirm('确定删除吗?')) {
    //         $(this).parents('.comment-box').remove();
    //     }

    // })
    $(document).on('click','.comment-operate',function(){
        if (confirm('确定删除吗?')) {
            $(this).parents('.comment-box').remove();
        }
    })
    //评论框加高度
    $(document).on('click','.comment',function(){
        $(this).height(80);
    })
    //评论点赞
    $(document).on('click','.comment-praise',function(){
        var num=parseInt($(this).attr('total'))+1;
        $(this).attr('total',num);
        $(this).html(num+'赞');
    })
    // 说说点赞
    $(document).on('click','.praise',function(){
        var num=parseInt($('.praises-total').attr('total'))+1;
        $('.praises-total').attr('total',num);
        $('.praises-total').html('有'+num+'人觉得很赞');
    })
    //删除说说
    $('.close').on('click',function(){
        if (confirm('确定删除吗?')) {
            $(this).parents('.box').remove();
        }
    })

  })

    
</script>
</body>
</html>

运行实例 »

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Correction status:Uncorrected

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