在此页

• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

非标
此特征是非标准的，且不在标准轨道中。不要在面向 Web 的生产站点中使用它：它不适用于每个用户。实现之间可能存在大的不兼容性，且行为将来可能改变。

弃用
This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the 兼容性表格 at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

DataTransfer.mozItemCount property returns the number of items being dragged. This can be used, for example, to get the number of files being dragged.

注意： This property is Gecko-specific.

此特性是 只读 .

句法

dataTransfer.mozItemCount;
				

返回值

A 编号 representing the number of items being dragged.

范例

This example shows the use of the mozItemCount 特性。

function drop_handler(event)
{
  var files = [];
  var dt = event.dataTransfer;
  for (var i = 0; i < dt.mozItemCount; i++)
    files.push(dt.mozGetDataAt("application/x-moz-file", i));
}
				

规范

This property is not defined in any Web standard.

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
mozItemCount 非标	Chrome No	Edge No	Firefox ? — 71	IE No	Opera No	Safari No	WebView Android No	Chrome Android No	Firefox Android ?	Opera Android No	Safari iOS No	Samsung Internet Android No

图例

不支持

不支持

兼容性未知 ?

兼容性未知

实验。期望将来行为有所改变。

实验。期望将来行为有所改变。

非标。预期跨浏览器支持较差。

非标。预期跨浏览器支持较差。

另请参阅

元数据

• 最后修改： Nov 6, 2019

相关话题

1. HTML 拖放 API
2. DataTransfer
3. 构造函数

   1. DataTransfer()
4. 特性

   1. dropEffect
   2. effectAllowed
   3. 文件
   4. 项
   5. mozCursor
   6. mozItemCount
   7. mozSourceNode
   8. mozUserCancelled
   9. 类型
5. 方法

   1. addElement()
   2. clearData()
   3. getData()
   4. mozClearDataAt()
   5. mozGetDataAt()
   6. mozSetDataAt()
   7. mozTypesAt()
   8. setData()
   9. setDragImage()
6. Related pages for HTML Drag and Drop API

   1. DataTransferItem
   2. DataTransferItemList
   3. DragEvent