怎么样给<input type="file" name="file1">设置初始值？

在微软的文档里说明是只读的
VALUE Attribute | value Property--------------------------------------------------------------------------------Sets or retrieves the value of the object.SyntaxHTML <ELEMENT VALUE = sValue ... >
Scripting object.value [ = sValue ] Possible Values....
file The value, a file name, typed by the user into the control. Unlike other controls, this value is read-only.
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