layui文件上传demo

以下是一个简单的 layui 文件上传的示例代码：

HTML 代码：

<div class="layui-upload">
  <button type="button" class="layui-btn" id="test-upload-normal">选择文件</button>
  <div class="layui-upload-list">
    <table class="layui-table">
      <thead>
        <tr>
          <th>文件名</th>
          <th>大小</th>
          <th>状态</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody id="demoList"></tbody>
    </table>
  </div>
  <button type="button" class="layui-btn" id="test-upload-reload">重传</button>
  <button type="button" class="layui-btn layui-btn-danger" id="test-upload-delete">删除</button>
</div>

JavaScript 代码：

layui.use('upload', function(){
  var $ = layui.jquery
  ,upload = layui.upload;
  
  //普通图片上传
  var uploadInst = upload.render({
    elem: '#test-upload-normal'
    ,url: '/upload/'
    ,accept: 'file' //允许上传的文件类型
    ,done: function(res){
      //上传完毕回调
      console.log(res);
      if(res.code == 0){
        var demoText = $('#demoText');
        demoText.html('<span style="color: #5FB878;">上传成功</span>');
        $('#demoList').append('<tr><td>'+ res.filename +'</td><td>'+ (res.size/1024).toFixed(1) +'kb</td><td>上传成功</td><td><button class="layui-btn layui-btn-xs layui-btn-danger demo-delete">删除</button></td></tr>');
      }else{
        var demoText = $('#demoText');
        demoText.html('<span style="color: #FF5722;">上传失败</span> ' + res.msg);
      }
    }
    ,error: function(){
      //请求异常回调
      var demoText = $('#demoText');
      demoText.html('<span style="color: #FF5722;">上传失败</span> 服务器异常，请稍后重试');
    }
  });
  
  //文件列表操作
  var demoListView = $('#demoList')
  ,uploadListIns = upload.render({
    elem: '#test-list'
    ,url: '/upload/'
    ,accept: 'file'
    ,multiple: true
    ,auto: false
    ,bindAction: '#testListAction'
    ,choose: function(obj){
      var files = obj.pushFile();
      //预读本地文件示例，不支持ie8
      obj.preview(function(index, file, result){
        console.log(index, file, result);
        $('#demoList').append('<tr><td>'+ file.name +'</td><td>'+ (file.size/1024).toFixed(1) +'kb</td><td>等待上传</td><td><button class="layui-btn layui-btn-xs demo-reload layui-hide">重传</button><button class="layui-btn layui-btn-xs layui-btn-danger demo-delete">删除</button></td></tr>')
      });
    }
    ,done: function(res, index, upload){
      if(res.code == 0){ //上传成功
        var tr = demoListView.find('tr').eq(index)
        ,tds = tr.children();
        tds.eq(2).html('<span style="color: #5FB878;">上传成功</span>');
        tds.eq(3).html('<button class="layui-btn layui-btn-xs layui-btn-danger demo-delete">删除</button>'); //清空操作
        return delete this.files[index]; //删除文件队列已经上传成功的文件
      }
      this.error(index, upload);
    }
    ,error: function(index, upload){
      var tr = demoListView.find('tr').eq(index)
      ,tds = tr.children();
      tds.eq(2).html('<span style="color: #FF5722;">上传失败</span>');
      tds.eq(3).find('.demo-reload').removeClass('layui-hide'); //显示重传
    }
  });
  
  //删除文件
  $('#demoList').on('click', '.demo-delete', function(){
    var tr = $(this).parents('tr')
    ,index = tr.index();
    //删除对应的文件
    uploadListIns.config.elem.next()[0].value = '';
    uploadListIns.config.files.splice(index, 1);
    tr.remove();
  });
  
  //重传文件
  $('#demoList').on('click', '.demo-reload', function(){
    var tr = $(this).parents('tr')
    ,index = tr.index();
    //删除对应的文件
    uploadListIns.config.files.splice(index, 1);
    tr.remove();
    uploadListIns.upload();
  });
});

这个示例代码实现了单文件上传和多文件上传的功能，并且可以实现文件的删除和重传操作。你可以根据自己的需求进行修改和扩展。