设置 Axios 请求类型为 form-data

const instance = axios.create({
    baseURL: "https://api.test.com",
    //设置axios为form-data
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
    transformRequest: [function (data) {
        let ret = ''
        for (let it in data) {
            ret += encodeURIComponent(it) + '=' + encodeURIComponent(data[it]) + '&'
        }
        return ret
    }]
})