axios 上传图片

let data = new FormData();

        for (var i = 0; i < files.length; i++) {
            let file = files.item(i);
            data.append('images[' + i + ']', file, file.name);
        }

        const config = {
            headers: { 'content-type': 'multipart/form-data' }
        }

        return axios.post('/api/images', data, config)