nicenote/public/论轮播图的原理.html
2018-07-13 19:29:18 +08:00

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解析卡片式轮播图 |
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<ol class="post-toc"><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#原理"><span class="post-toc-number">1.</span> <span class="post-toc-text">原理</span></a></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#无限滚动"><span class="post-toc-number">2.</span> <span class="post-toc-text">无限滚动</span></a></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#小按钮切换"><span class="post-toc-number">3.</span> <span class="post-toc-text">小按钮切换</span></a></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#延迟动画函数"><span class="post-toc-number">4.</span> <span class="post-toc-text">延迟动画函数</span></a></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#自动播放"><span class="post-toc-number">5.</span> <span class="post-toc-text">自动播放</span></a></li></ol>
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解析卡片式轮播图
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<strong>Feax</strong>
<span>6月 24, 2017</span>
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<li class="mdl-menu__item">在其它设备中阅读本文章</li>
<img src="data:image/png;base64,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">
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<a class="post_tag-link" href="/tags/轮播图/">轮播图</a>
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<blockquote>
<p>小记:前两天面试,展现项目过程中经理问我轮播图的原理,我一脸懵逼,因为当时有现成的插件,所以我没怎么去研究,当然,我也知道该来的还是要来的…</p>
</blockquote>
<p>首先我大概讲一下,传统轮播图的主要部分:</p>
<ul>
<li>图片(废话)</li>
<li>左右两边的button</li>
<li>可以跳转的小点</li>
</ul>
<p><a href="http://jzxer.cn/card/" target="_blank" rel="noopener">demo</a></p>
<h3 id="原理"><a href="#原理" class="headerlink" title="原理"></a>原理</h3><ul>
<li>轮播图的原理就是一个长图里面有很多张图外面包一层展示窗口将属性设置成overflowhidden达到只显示一张的效果当点击左右两边的按钮时会按照像素来跳转</li>
</ul>
<h3 id="无限滚动"><a href="#无限滚动" class="headerlink" title="无限滚动"></a>无限滚动</h3><ul>
<li>我给两个按钮设为 <b>prev next</b> 一个在点击后,长图会增加一张图的宽度,一个是减少一个图的宽度,在图片的头和尾部加一张图,结构大概为:</li>
</ul>
<pre><code class="html">&lt;div id=&quot;list&quot; style=&quot;left:-200px&quot;&gt;
&lt;img src=&quot;./img/5.jpg&quot; alt=&quot;&quot;&gt;
&lt;img src=&quot;./img/1.jpg&quot; alt=&quot;&quot;&gt;
&lt;img src=&quot;./img/2.jpg&quot; alt=&quot;&quot;&gt;
&lt;img src=&quot;./img/3.jpg&quot; alt=&quot;&quot;&gt;
&lt;img src=&quot;./img/4.jpg&quot; alt=&quot;&quot;&gt;
&lt;img src=&quot;./img/5.jpg&quot; alt=&quot;&quot;&gt;
&lt;img src=&quot;./img/1.jpg&quot; alt=&quot;&quot;&gt;
&lt;/div&gt;
</code></pre>
<p>当是最后一张图或第一张图时,将第一张上一张跳转为最后一张时的宽,最后一张跳转为第一张时的宽</p>
<pre><code class="js">if (newList &lt; -1000) {
dot = 1
list.style.left = -200 + &#39;px&#39;
}
if (newList &gt; -200) {
dot = 5
list.style.left = -1000 + &#39;px&#39;
}
</code></pre>
<h3 id="小按钮切换"><a href="#小按钮切换" class="headerlink" title="小按钮切换"></a>小按钮切换</h3><p>这要实现的思想有</p>
<ul>
<li>点了小按钮,背景色会变</li>
<li>当点击切换到其他按钮,图片切换,且上一个按钮会变回原来的颜色</li>
</ul>
<pre><code class="js">function showBtn() {
for (var i = 0; i &lt; btns.length; i++) {
if (btns[i].className == &#39;show-btn&#39;) {
btns[i].className = &#39;&#39;
break
}
}
btns[dot-1].className = &#39;show-btn&#39;
}
//遍历数组,将有该属性设为空
for (var i = 0; i &lt; btns.length; i++) {
btns[i].onclick = function () {
if (this.className == &#39;showBtn&#39;) {
return
}
var myIndex = parseInt(this.getAttribute(&#39;index&#39;))
var leng = -200 * (myIndex - dot)
animate(leng)
dot = myIndex
showBtn()
}
}
//遍历数组将每一个小按钮设了个index属性这里用到 getAttribute 可以获取除了普通style 或 class 之外的一些属性获取index值点击时得到当前的index值正好和当前的dot值相减可得跳转的距离
</code></pre>
<blockquote>
<p>这里要注意的是当小按钮被重复按的时候给他一个判断不然重复点击同一个图标会重复发生相同事件占内存耗cpu</p>
</blockquote>
<h3 id="延迟动画函数"><a href="#延迟动画函数" class="headerlink" title="延迟动画函数"></a>延迟动画函数</h3><p>就是当用户点击时,有一个慢慢偏移的过程,而不是闪现的动作,我们来看看实现原理</p>
<ul>
<li>首先,定义参数</li>
</ul>
<pre><code class="js">var time = 300 //位移总时间
var interval = 10 //位移时间间隔
var speed = leng/(time/interval) //每次位移量,就是一共调用多少次的意思
</code></pre>
<ul>
<li>设置递归函数</li>
</ul>
<pre><code class="js">if ((speed &lt; 0 &amp;&amp; parseInt(list.style.left) &gt; newList) || (speed &gt; 0 &amp;&amp; parseInt(list.style.left) &lt; newList)) {
list.style.left = parseInt(list.style.left) + speed + &#39;px&#39;
setTimeout(go, interval) //递归,调用自身函数
</code></pre>
<ul>
<li>判断是否仍在动画</li>
</ul>
<p>如果用户一直在点击切换图时,如果电脑配置不好,或是其他一些因素,可能会轮播卡顿,为了防止这一现象,就用一个判断来看上一次动画是否完成,若未完成就不能继续切换,等到这次动画跳转完为止</p>
<pre><code class="js">var animated = false //设初值
if(!animated) {
animate(200)
} //如果为false则继续动画
</code></pre>
<h3 id="自动播放"><a href="#自动播放" class="headerlink" title="自动播放"></a>自动播放</h3><p>首先给个思路,当鼠标移入的时候,自动播放停止,移出的时候开始自动播放</p>
<ul>
<li>我们设两个函数play 和 stop</li>
</ul>
<pre><code class="js">function play() {
timer = setTimeout(function() {
next.onclick()
play()
},interval)
}
function stop() {
clearTimeout(timer)
}
</code></pre>
<p>给整个 container 容器添加该鼠标事件</p>
<p>这年头还是不能偷懒啊,说不定当时知道这个人家就把给我要了呢,好气哦…</p>
<blockquote>
<p>改天再研究下旋转木马的那种装个13…</p>
</blockquote>
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