图片自动上传极度精简版

直接上代码

<!--支持快捷ajax传递数据-->
<script src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
<form action="./update.php" method="post" class="form-horizontal" role="form" enctype="multipart/form-data" id="uploadForm" name="uploadForm">
	<a href="javascript:update()"  id="update">
		<span class="glyphicon glyphicon-upload">
			<input type="file" name="file" id="file" accept="image/*" style="display:none;" onchange="upload(this)" />
		</span>
		上传
	</a>
</form>
<script>
	function update() {
		$('#file').click();
	}

	function upload(fileObj) {
		if (fileObj.value != '') {
			document.uploadForm.action = 'update.php';
			document.uploadForm.submit();
		}
		return false;
	}
</script>