Access to XMLHttpRequest at ‘http://192.168.12.119/api/design/upload_img’ from origin ‘http://localhost:8080’ has been blocked by CORS policy: Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.

问题的原因是出现了跨域，但是针对 这里element upload的话，有别的处理办法

先看upload中代码

<el-upload
        ref="upload"
        action="http://192.168.249.199/api/design/upload_img"
        :on-preview="handlePreview"
        :on-remove="handleRemove"
        :file-list="fileList"
        :auto-upload="false"
        :data="projects_list[0]"
        :headers="file_headers"
        accept=".jpg,.jpeg,.png"
>

我是写全了请求地址

意思就是不用写全请求地址就不会出现跨域错误了，改了之后

控制台正常了


如果需要解决跨域查看文章：https://editor.csdn.net/md/?articleId=112295248

希望对你有帮助！！