js實現無縫連接輪播圖（一）獲取左右箭頭，實現顯示隱藏左右箭頭

 

<!-- 這個animate.js 必須寫到 index.js的上面引入 -->
<script src="js/animate.js"></script>
<!-- 引入我們首頁的js文件 -->
<script src="js/index.js"></script>

 

HTML代碼

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<div class="focus fl">
<!-- 左側按鈕 -->
<a href="javascript:;" class="arrow-l">
&lt;
</a>
<!-- 右側按鈕 -->
<a href="javascript:;" class="arrow-r">  </a>
<!-- 核心的滾動區域 -->
<ul>
<li>
<a href="#"><img src="upload/focus.jpg" alt=""></a>
</li>
<li>
<a href="#"><img src="upload/focus1.jpg" alt=""></a>
</li>
<li>
<a href="#"><img src="upload/focus2.jpg" alt=""></a>
</li>
<li>
<a href="#"><img src="upload/focus3.jpg" alt=""></a>
</li>
</ul>
<!-- 小圓點 -->
<ol class="circle">

</ol>
</div>

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js代碼

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window.addEventListener(‘load’,function(){

//1、獲取元素

var arrow-l = document.querySelector(‘.arrow-l’);

var arrow-r = document.querySelector(‘.arrow-r’);

var focus = document.querySelector(‘.focus’);

var focuwidth = focus.offsetWidth;

focus.addEventListener(‘mouseenter’,function(){

　　arrow-l.style.display = ‘block’;

　　arrow-r.style.display = ‘block’;

});

focus.addEventListener(‘mouseleave’,function(){

　　arrow-l.style.display = ‘none’；

　　arrow-r.style.display =‘none’;

});

 

})