How to get the extra parameters passed by element upload: data?

I use element to upload images and send extra parameters. How do I get these extra parameters?
the file I printed on on-success is like this. What are the extra parameters of,: data?

part of the code:

<div v-for="(color_info,index_color) in color_list1" >
    :
    <input   type="text" v-model="color_info.color_name">
    <a @click="delete_color(index_color)" class="btn btn-info"></a>
    <br>
    :
    <input   type="text" v-model="color_info.price" >
    <br>
    :
    <input   type="text" v-model="color_info.stock" >
    <el-upload class="avatar-uploader"     
    action="http://localhost/bishe2/back/imge.php" 
    :show-file-list="false" 
    :on-success="handleAvatarSuccess2" 
    :before-upload="beforeAvatarUpload" 
    :data="color_info">
        <img v-if="color_url" :src="color_url" class="avatar">
        <i v-else class="el-icon-plus avatar-uploader-icon"></i>
    </el-upload>
</div>

what I want is to upload the color_info, while uploading the picture. I want to get the color_info.color_name, in on-success. I can"t find where the color_info is, and I can also get the color_info.color_name, in the background, so I want to know where the parameters passed by data are stored in file and how to get

header('Access-Control-Allow-Methods:post'); $fileName = $_FILES["file"]["name"]; ...... $json= array('id'=>$_POST['id']); $arr = json_decode(json_encode($json),true); $id = $arr['id']; echo "id:".$id;