JS- 清空file(兼容IE,火狐)
<script>function cleanFile(id){var _file = document.getElementById(id);if(_file.files){_file.value = "";}else{if (typeof _file != "object"){ return null; }var _span = document.createElement("span");_span.id = "__tt__";_file.parentNode.insertBefore(_span,_file);var tf = document.createElement("form");tf.appendChild(_file);document.getElementsByTagName("body")[0].appendChild(tf);tf.reset();_span.parentNode.insertBefore(_file,_span);_span.parentNode.removeChild(_span);_span = null;tf.parentNode.removeChild(tf);}}</script><input id="file1" type="file" /><input type="button" value="清空" onclick="cleanFile('file1')" />?