<div class="layui-form-item layui-form-text">
<label class="layui-form-label col-md-2">*</label>
<div class="layui-input-block">
<div class="layui-upload">
  <button type="button" class="layui-btn layui-btn-primary" id="test4"><i class="layui-icon"></i>点击上传文件</button>
  <input class="layui-upload-file" type="file" accept="" name="file">
</div>
</div>
</div>

<script>
  upload.render({ //允许上传的文件后缀
    elem: '#test4'
    ,url: 'https://httpbin.org/post' //改成您自己的上传接口
    ,accept: 'file' //普通文件
    ,exts: 'zip|rar|7z' //只允许上传压缩文件
    ,done: function(res){
      layer.msg('上传成功');
      console.log(res)
    }
  });
</script>