清除文件上传框里的value值
很多年前，做清除文件上传框里的value值时，怎么也清不掉，一时也就不了了之了,今天又碰到此问题，原来IE和FF下处理不一样，特再记一下
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><HTML> <HEAD> <TITLE> New Document </TITLE> <META NAME="Generator" CONTENT="EditPlus"> <META NAME="Author" CONTENT=""> <META NAME="Keywords" CONTENT=""> <META NAME="Description" CONTENT=""><script>function clearFile(){var obj=document.getElementById("file"); //obj.value='' //FF下obj.select(); //IE下document.execCommand('Delete'); }</script> </HEAD> <BODY>上传:<input id="file" type="file" /><br/><button onclick="clearFile()">清除</button> </BODY></HTML>