A brief discussion on the problem that using attr to modify form enctype in jquery does not work

To upload files, you need to set the enctype of the form element to 'multipart/form-data'. You can use jquery's attr method to test successfully on the newer mainstream browsers, but it will not work on IE. Later, I checked that Internet Explorer 6, 7, and 8 (9+ was not tested because the development machine is

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