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为什么不可以显示箭头?

<style>

*{margin:0px;

  padding:0px;

  text-decoration:0px;}

  

#container{width:1920px;

           height:520px;

  overflow:hidden;

  position:relative;}

  

#list{z-index:1;

      position:absolute;

 width:13760px;

 height:520px;}


#buttons{z-index:2;

         position:absolute;

width:150px;

height:20px;

left:878px;

bottom:12px;}


#buttons span{cursor:pointer;

              width:5px;

 height:5px;

              border-radius:100px;;

 float:left;

 border:2px solid #FFF;

 margin:8px;}


#buttons .on{background:#6C6C6C;}


.arrow{cursor:pointer;

       width:50px;

  height:50px;

  position:absolute;

  top:180px;

  z-index:2;

  color:#FFF;

  background:"black";

  font-size:20px;

  font-weight:10px;

}


#container:hover .arrow{display:block;

}


#pre{left:10px;

}


#next{right:10px;

}

</style>


</head>


<body>

<div id="container">

<div id="list" style="left:-1920px;">

<img src="images/6.png" />

<img src="images/1.png" />

<img src="images/2.png" />

<img src="images/3.png"/>

<img src="images/4.png"/>

<img src="images/5.png" />

<img src="images/6.png" />

<img src="images/1.png" />

</div>


<div id="buttons">

<span index="1" class="on"></span>

<span index="2"></span>

<span index="3"></span>

<span index="4"></span>

<span index="5"></span>

<span index="6"></span>


<a href="#" class="arrow" id="pre">  </a>

<a href="#" class="arrow" id="next"> </a>

</div>




</div>


</body>

</html>


CHIEMINCHAN
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1回答

业余奶茶品鉴师

html 部分代码改为:<div id="container">     <div id="list" style="left:-1920px;">         <img src="1.jpg" />         <img src="2.jpg" />     </div>     <div id="buttons">         <span index="1" class="on"></span>         <span index="2"></span>     </div>      <a href="#" class="arrow" id="pre"> </a>     <a href="#" class="arrow" id="next"> </a> </div>望采纳
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