清除上传控件 File 的值

因为File控件的value值是只读的，所以用document.getElementById("File1").value="" 并不能清楚file控件的值

可以用一下方法实现

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1. <inputid="File1"type="file"runat="server"/>
3. <inputid="btnClear"value="清空"onclick="clear()"/>
7. functionclear()
9. {
11. varfile1=document.getElementById("File1");
13. file1.select();
15. document.execCommand('Delete')
17. }

<input id="File1" type="file" runat="server" /> <input id="btnClear" value="清空" onclick="clear()" /> function clear() { var file1=document.getElementById("File1"); file1.select(); document.execCommand('Delete') }