HTML DOM input file 对象

输入文件上传对象

输入 FileUpload 对象表示 type="file" 的 HTML <input> 元素。

您可以使用 getElementById() 访问 type="file" 的 <input> 元素：

var x = document.getElementById("myFile");

提示：您还可以通过搜索来访问 <input type="file">元素表格的集合。

您可以使用 document.createElement() 方法创建 type="file" 的 <input> 元素：

var x = document.createElement("INPUT");
x.setAttribute("type", "file");

Property	Description
accept	Sets or returns the value of the accept attribute of the file upload button
autofocus	Sets or returns whether a file upload button should automatically get focus upon page load
defaultValue	Sets or returns the default value of the file upload button
disabled	Sets or returns whether the file upload button is disabled, or not
files	Returns a FileList object that represents the file or files selected with the file upload button
form	Returns a reference to the form that contains the file upload button
multiple	Sets or returns whether a user is allowed to select more than one file in the file upload field
name	Sets or returns the value of the name attribute of the file upload button
required	Sets or returns whether a file in the file upload field must be selected before submitting a form
type	Returns which type of form element the file upload button is
value	Returns the path or the name of the selected file

输入文件上传对象还支持标准特性和事件。