moxunpw
/
layui_toolnb


			
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<!DOCTYPE html>
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<title>镜像站@流加载文档 - Layui</title>
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<ul class="site-dir">
  <li><a href="#use"><cite>使用</cite></a></li>
  <li><a href="#load"><cite>信息流</cite></a></li>
  <li><a href="#lazyimg"><cite>图片懒加载</cite></a></li>
</ul>
<div class="layui-container layui-row">
  
<div class="layui-col-md3">
  <div class="layui-panel site-menu">
    <ul class="layui-menu layui-menu-lg">
      <li class="layui-menu-item-group" lay-options="{type: 'group', isAllowSpread: true}">
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      <li class="layui-menu-item-group" lay-options="{type: 'group', isAllowSpread: true}">
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          页面元素
        </div>
        <hr>
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          <li class="">
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              </a>
            </div>
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              <a href="../element/anim.html" tppabs="http://www.layui.com/doc/element/anim.html">
                <span>动画 </span>
                <span class="layui-font-12 layui-font-gray">内置 CSS3 动画</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="../element/button.html" tppabs="http://www.layui.com/doc/element/button.html">
                <span>按钮 </span>
                <span class="layui-font-12 layui-font-gray">button</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="../element/form.html" tppabs="http://www.layui.com/doc/element/form.html">
                <span>表单 </span>
                <span class="layui-font-12 layui-font-gray">form 元素集合</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="../element/nav.html" tppabs="http://www.layui.com/doc/element/nav.html">
                <span>导航 </span>
                <span class="layui-font-12 layui-font-gray">nav 面包屑</span>
              </a>
            </div>
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          <li class="">
            <div class="layui-menu-body-title">
              <a href="../element/menu.html" tppabs="http://www.layui.com/doc/element/menu.html">
                <span>菜单 </span>
                <span class="layui-font-12 layui-font-gray">menu 基础菜单</span>
                
                  <span class="layui-badge-dot"></span>
                
              </a>
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              <a href="../element/tab.html" tppabs="http://www.layui.com/doc/element/tab.html">
                <span>选项卡 </span>
                <span class="layui-font-12 layui-font-gray">Tabs 切换</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="../element/progress.html" tppabs="http://www.layui.com/doc/element/progress.html">
                <span>进度条 </span>
                <span class="layui-font-12 layui-font-gray">progress</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="../element/panel.html" tppabs="http://www.layui.com/doc/element/panel.html">
                <span>面板 </span>
                <span class="layui-font-12 layui-font-gray">panel 卡片 折叠</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="../element/table.html" tppabs="http://www.layui.com/doc/element/table.html">
                <span>表格 </span>
                <span class="layui-font-12 layui-font-gray">静态 table</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="../element/badge.html" tppabs="http://www.layui.com/doc/element/badge.html">
                <span>徽章 </span>
                <span class="layui-font-12 layui-font-gray">小圆点  小边框</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="../element/timeline.html" tppabs="http://www.layui.com/doc/element/timeline.html">
                <span>时间线 </span>
                <span class="layui-font-12 layui-font-gray">timeline</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="../element/auxiliar.html" tppabs="http://www.layui.com/doc/element/auxiliar.html">
                <span>辅助 </span>
                <span class="layui-font-12 layui-font-gray">引用 字段集 横线等</span>
              </a>
            </div>
          </li>
        </ul>
      </li>
      
      <li class="layui-menu-item-group" lay-options="{type: 'group', isAllowSpread: true}">
        <div class="layui-menu-body-title">
          内置模块
        </div>
        <hr>
        <ul>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="layer.html" tppabs="http://www.layui.com/doc/modules/layer.html">
                <span>弹出层 </span>
                <span class="layui-font-12 layui-font-gray">layer</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="laydate.html" tppabs="http://www.layui.com/doc/modules/laydate.html">
                <span>日期与时间选择 </span>
                <span class="layui-font-12 layui-font-gray">laydate</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="laypage.html" tppabs="http://www.layui.com/doc/modules/laypage.html">
                <span>分页 </span>
                <span class="layui-font-12 layui-font-gray">laypage</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="laytpl.html" tppabs="http://www.layui.com/doc/modules/laytpl.html">
                <span>模板引擎 </span>
                <span class="layui-font-12 layui-font-gray">laytpl</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="table.html" tppabs="http://www.layui.com/doc/modules/table.html">
                <span>数据表格 </span>
                <span class="layui-font-12 layui-font-gray">table</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="form.html" tppabs="http://www.layui.com/doc/modules/form.html">
                <span>表单 </span>
                <span class="layui-font-12 layui-font-gray">form</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="upload.html" tppabs="http://www.layui.com/doc/modules/upload.html">
                <span>文件上传 </span>
                <span class="layui-font-12 layui-font-gray">upload</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="dropdown.html" tppabs="http://www.layui.com/doc/modules/dropdown.html">
                <span>下拉菜单 </span>
                <span class="layui-font-12 layui-font-gray">dropdown</span>
                
                  <span class="layui-badge-dot"></span>
                
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="transfer.html" tppabs="http://www.layui.com/doc/modules/transfer.html">
                <span>穿梭框 </span>
                <span class="layui-font-12 layui-font-gray">transfer</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="tree.html" tppabs="http://www.layui.com/doc/modules/tree.html">
                <span>树形组件 </span>
                <span class="layui-font-12 layui-font-gray">tree</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="colorpicker.html" tppabs="http://www.layui.com/doc/modules/colorpicker.html">
                <span>颜色选择器 </span>
                <span class="layui-font-12 layui-font-gray">colorpicker</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="element.html" tppabs="http://www.layui.com/doc/modules/element.html">
                <span>常用元素操作 </span>
                <span class="layui-font-12 layui-font-gray">element</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="slider.html" tppabs="http://www.layui.com/doc/modules/slider.html">
                <span>滑块 </span>
                <span class="layui-font-12 layui-font-gray">slider</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="rate.html" tppabs="http://www.layui.com/doc/modules/rate.html">
                <span>评分 </span>
                <span class="layui-font-12 layui-font-gray">rate</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="carousel.html" tppabs="http://www.layui.com/doc/modules/carousel.html">
                <span>轮播 </span>
                <span class="layui-font-12 layui-font-gray">carousel</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="layedit.html" tppabs="http://www.layui.com/doc/modules/layedit.html">
                <span>富文本编辑器 </span>
                <span class="layui-font-12 layui-font-gray">layedit</span>
              </a>
            </div>
          </li>
          <li class="layui-menu-item-checked2">
            <div class="layui-menu-body-title">
              <a href="flow.html" tppabs="http://www.layui.com/doc/modules/flow.html">
                <span>流加载 </span>
                <span class="layui-font-12 layui-font-gray">flow</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="util.html" tppabs="http://www.layui.com/doc/modules/util.html">
                <span>工具组件 </span>
                <span class="layui-font-12 layui-font-gray">util</span>
              </a>
            </div>
          </li>
          <li class="">
            <div class="layui-menu-body-title">
              <a href="code.html" tppabs="http://www.layui.com/doc/modules/code.html">
                <span>代码高亮显示 </span>
                <span class="layui-font-12 layui-font-gray">code</span>
              </a>
            </div>
          </li>
        </ul>
      </li>
    </ul>
  </div>
  <div class="layui-hide-v"> - </div>
</div>

  
  <div class="layui-col-md9 site-content">
    <h1 class="site-h1"><i class="layui-icon">&#xe636;</i> 流加载文档 - layui.flow</h1>
    <blockquote class="site-text layui-elem-quote">
      该模块包含<em>信息流加载</em>和<em>图片懒加载</em>两大核心支持，无论是对服务端、还是前端体验，都有非常大的性能帮助。你可能已经在太多的地方看到她们的身影了，但不妨现在开始，体验一下Layui更为简单和高效的Flow吧。
    </blockquote>
    <blockquote class="site-text layui-elem-quote">
      <p>模块加载名称：<em>flow</em></p>
    </blockquote>
    
    
    <div class="site-title">
      <a name="use"></a>
      <fieldset><legend>使用</legend></fieldset>
    </div>
    <div class="site-text">
      <p>flow模块包含两个核心方法，如下所示：</p>
      <pre class="layui-code">
layui.use('flow', function(){
  var flow = layui.flow;
  //信息流
  flow.load(options);
  
  //图片懒加载
  flow.lazyimg(options);
});
      </pre>
      <p>下面将对她们进行详细介绍。</p>
    </div> 
    
    <div class="site-title">
      <a name="load"></a>
      <fieldset><legend>信息流</legend></fieldset>
    </div>
    <div class="site-text">
      <p>信息流即异步逐页渲染列表元素，这是你页面已经存在的一段列表，你页面初始时只显示了6个</p>
      <pre class="layui-code" lay-title="HTML" lay-encode="true">
<ul id="demo">
  &lt;li>1&lt;/li>
  &lt;li>2&lt;/li>
  ……
  &lt;li>6&lt;/li>
</ul>
      </pre>
      <p>你想通过加载更多来显示余下列表，那么你只需要执行方法：<a>flow.load(options)</a> 即可</p>
      <pre class="layui-code" lay-title="JavaScript" lay-encode="true">
layui.use('flow', function(){
  var $ = layui.jquery; //不用额外加载jQuery，flow模块本身是有依赖jQuery的，直接用即可。
  var flow = layui.flow;
  flow.load({
    elem: '#demo' //指定列表容器
    ,done: function(page, next){ //到达临界点（默认滚动触发），触发下一页
      var lis = [];
      //以jQuery的Ajax请求为例，请求下一页数据（注意：page是从2开始返回）
      $.get('/api/list?page='+page, function(res){
        //假设你的列表返回在data集合中
        layui.each(res.data, function(index, item){
          lis.push('<li>'+ item.title +'</li>');
        }); 
        
        //执行下一页渲染，第二参数为：满足“加载更多”的条件，即后面仍有分页
        //pages为Ajax返回的总页数，只有当前页小于总页数的情况下，才会继续出现加载更多
        next(lis.join(''), page < res.pages);    
      });
    }
  });
});
      </pre>
      <p>上述是一个比较简单的例子，以下是信息流完整的参数支撑（即options对象），它们将有助于你更灵活地应对各种场景</p>
      <table class="layui-table">
        <thead>
          <tr>
            <th>参数</th>
            <th>类型</th>
            <th>描述</th>
          </tr> 
        </thead>
        <tbody>
          <tr>
            <td>elem</td>
            <td>string</td>
            <td>指定列表容器的选择器</td>
          </tr>
          <tr>
            <td>scrollElem</td>
            <td>string</td>
            <td>滚动条所在元素选择器，默认document。如果你不是通过窗口滚动来触发流加载，而是页面中的某一个容器的滚动条，那么通过该参数指定即可。</td>
          </tr>
          <tr>
            <td>isAuto</td>
            <td>boolean</td>
            <td>是否自动加载。默认true。如果设为false，点会在列表底部生成一个“加载更多”的button，则只能点击它才会加载下一页数据。</td>
          </tr>
          <tr>
            <td>end</td>
            <td>string</td>
            <td>用于显示末页内容，可传入任意HTML字符。默认为：没有更多了</td>
          </tr>
          <tr>
            <td>isLazyimg</td>
            <td>boolean</td>
            <td>是否开启图片懒加载。默认false。如果设为true，则只会对在可视区域的图片进行按需加载。但与此同时，在拼接列表字符的时候，你不能给列表中的img元素赋值src，必须要用lay-src取代，如：
            <pre class="layui-code" lay-title="JavaScript片段">     
layui.each(res.data, function(index, item){
  lis.push('&lt;li>&lt;img lay-src="'+ item.src +'">&lt;/li>');
});   
            </pre>
            </td>
          </tr>
          <tr>
            <td>mb</td>
            <td>number</td>
            <td>与底部的临界距离，默认50。即当滚动条与底部产生该距离时，触发加载。注意：只有在isAuto为true时有效。<br>额，等等。。mb=margin-bottom，可不是骂人的呀。</td>
          </tr>
          <tr>
            <td>done</td>
            <td>function</td>
            <td>到达临界点触发加载的回调。信息流最重要的一个存在。携带两个参数：
            <pre class="layui-code" lay-title="JavaScript片段">
done: function(page, next){
  //请注意：layui 1.0.5 之前的版本是从第2页开始返回，也就是说你的第一页数据并非done来触发加载
  （为之前这个愚蠢的设计表示抱歉）
  //从 layui 1.0.5 的版本开始，page是从1开始返回，初始时即会执行一次done回调。
  //console.log(page) //获得当前页
  
  //执行下一页渲染，第二参数为：满足“加载更多”的条件，即后面仍有分页
  //只有当前页小于总页数的情况下，才会继续出现加载更多
  next('列表HTML片段', page < res.pages); 
}
            </pre>
            </td>
          </tr>
        </tbody>
      </table>
    </div>
    
    <div class="site-title">
      <a name="lazyimg"></a>
      <fieldset><legend>图片懒加载</legend></fieldset>
    </div>
    <div class="site-text">
      <p>应该说比当前市面上任何一个懒加载的实现都更为强劲和轻量，她用不足80行代码巧妙地提供了一个始终加载当前屏图片的高性能方案（无论上滑还是下滑）。对你的网站因为图片可能带来的压力，可做出很好的应对。</p>
      <p>语法：<em>flow.lazyimg(options)</em></p>
      <pre class="layui-code">
layui.use('flow', function(){
  var flow = layui.flow;
  //当你执行这样一个方法时，即对页面中的全部带有 lay-src 的 img 元素开启了懒加载（当然你也可以指定相关 img）
  flow.lazyimg(); 
});
      </pre>
      <p>如上所述，它只会针对以下 img 元素有效：</p>
      <pre class="layui-code" lay-title="HTML">
&lt;img src="占位图地址" lay-src="预加载图地址"> 
&lt;img src="" src="bbb.jpg">
&lt;img src="" lay-src="ccc.jpg">       
      </pre>
      <blockquote class="layui-elem-quote layui-text">
        <span class=" layui-font-red">占位图功能为 layui 2.6.6 开始新增。</span>
        这本应在 1.0 就该支持，但由于重心在其他组件，导致姗姗来迟。
      </blockquote>
      
      <p>如你所见，图片懒加载的使用极其简单，其参数（options 对象）可支持的 key 如下表所示：</p>
      <table class="layui-table">
        <thead>
          <tr>
            <th>参数</th>
            <th>类型</th>
            <th>描述</th>
          </tr> 
        </thead>
        <tbody>
          <tr>
            <td>elem</td>
            <td>string</td>
            <td>指定开启懒加载的img元素选择器，如 elem: '.demo img' 或 elem: 'img.load'</td>
          </tr>
          <tr>
            <td>scrollElem</td>
            <td>string</td>
            <td>滚动条所在元素选择器，默认document。如果你不是通过窗口滚动来触发流加载，而是页面中的某一个容器的滚动条，那么通过该参数指定即可。</td>
          </tr>
          <tr>
        </tbody>
      </table>   
    </div> 
    
    <div class="site-title">
      <a name="other"></a>
      <fieldset><legend>结语</legend></fieldset>
    </div>
    <div class="site-text">
      <p>如果还有各种流行的流加载，你可以给我们提供建议，我们会在layui后续版本中选择性加入。</p>
    </div>
    
    <div class="layui-elem-quote">
  <p>layui - 在每一个细节中，用心与你沟通</p>
</div>
    
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