HTMLFormElement.enctype
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application/x-www-form-urlencoded: åå§çé»è®¤å¼multipart/form-data: éç¨äºä½¿ç¨<input>æ ç¾ä¸ä¼ æ件text/plain: HTML5 å¼å ¥çç±»å
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ç´ <button> or <input> çå±æ§ form.enctype æ¥æ¹å
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string = form.enctype form.enctype = string
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form.enctype = "application/x-www-form-urlencoded";