<form action="index/index/upload" method="POST" enctype="multipart/from-data" id="uploadform" onSubmit="return false">
<div class="inpuys">
<input type="file" name="file" id="uploadfile" value="选择文件" class="cho">
<input type="submit" value="上传" id="submit_btn" class="sub btn btn-info">
</div>
</form>

<script type="text/javascript" src="{$Think.config.web_root}js/jquery.min.js"></script>
<script type="text/javascript" src="{$Think.config.web_root}js/jquery.form.js"></script>
<script src="http://cdn.bootcss.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
var progressbox=$("#progressbox");
var progressbar=$("#progressbar");
var progress=$("#progress");
var completed="0%";
var options={
beforeSubmit:beforeSubmit,
uploadProgress:OnProgress,
success:afterSuccess,
resetForm:true
};
$("#uploadform").submit(function(){
$(this).ajaxSubmit(options);
return false;
});
function OnProgress(event,position,total,percentComplete ) {
progressbar.width(percentComplete + "%");
progress.html(percentComplete + "%");
}
function afterSuccess(){
$("#output").html("上传完成!!");
}
function beforeSubmit(){
if (!$("#uploadfile").val()) {
$("#output").html("请选择文件!!");
return false;
}
progressbar.width(completed);
progress.html(completed);
}
});
</script>

public function upload(){
// 获取表单上传文件 例如上传了001.jpg
$file = request()->file('file');
// 移动到框架应用根目录/public/uploads/ 目录下
$info = $file->move(ROOT_PATH . 'public' . DS . 'uploads');
if($info){
return "上传成功";
}else{
// 上传失败获取错误信息
echo $file->getError();
}
}