<Upload action="http://public.files.dpexpo.cn"
ref="upload"
:show-upload-list="false"
accept=".pdf"
:format="['pdf']"
:on-success="uploadSuccess"
:data="uploadParams"
:max-size="102400"
:before-upload="handleBeforeUpload">
<Buttontype="ghost"
icon="ios-cloud-upload-outline">Upload pdf</Button>
</Upload>

handleBeforeUpload(file) {
letthat=this;
return new Promise(function(resolve, reject) {
that.getUploadParams().then(function() {
that.$Notice.warning({
title:'文件准备上传',
desc:'文件 '+file.name+' 准备上传。',
duration:3
});
resolve();
});
});
},
getUploadParams() {
varthat=this;
return new Promise(function(resolve, reject) {
that.$http// 在此方法中调用后台数据
.get('/ossParams', {
params: {
dir:
'slide/conference/'+
that.$route.query.conference_id+
'/'
}
})
.then(function(response) {
console.log(response);
that.uploadParams=JSON.parse(response.data.data);
console.log(that.uploadParams);
resolve();
})
.catch(function(error) {
console.log(error);
});
});
},
uploadSuccess(evnet, file) {
console.log(file);
this.$Notice.success({
title:'文件上传成功',
desc:'文件 '+file.name+' 上传成功。',
duration:3
});
this.formValidate.slide_url=
'http://public.files.dpexpo.cn/slide/conference/'+
this.$route.query.conference_id+
'/'+
file.name;
},

以下是发放参数的api方法（laravel）：

public function ossParams(Request $request)
{
$id = 'LTA（your id）V1E';
$key = '4M5nIHs（your key）IelsW';
$host = 'http://public.files.dpexpo.cn';
$now = time();
$expire = 30; //设置该policy超时时间是10s. 即这个policy过了这个有效时间，将不能访问
$end = $now + $expire;
$expiration = $this->gmt_iso8601($end);
$dir = $request->dir ? $request->dir : 'user-dir/';
//最大文件大小.用户可以自己设置
$condition = array(0 => 'content-length-range', 1 => 0, 2 => 1048576000);
$conditions[] = $condition;
//表示用户上传的数据,必须是以$dir开始, 不然上传会失败,这一步不是必须项,只是为了安全起见,防止用户通过policy上传到别人的目录
$start = array(0 => 'starts-with', 1 => '$key', 2 => $dir);
$conditions[] = $start;
$arr = array('expiration' => $expiration, 'conditions' => $conditions);
//echo json_encode($arr);
//return;
$policy = json_encode($arr);
$base64_policy = base64_encode($policy);
$string_to_sign = $base64_policy;
$signature = base64_encode(hash_hmac('sha1', $string_to_sign, $key, true));
$response = array();
//$response['host'] = $host;
$response['key'] = $dir.'${filename}';
$response['policy'] = $base64_policy;
$response['OSSAccessKeyId'] = $id;
$response['Signature'] = $signature;
$response['expire'] = $end;
//这个参数是设置用户上传指定的前缀
//$response['dir'] = $dir;
$token = json_encode($response);
return$this->response->array(['data' => $token]);
}