cssjshtml axios post提交 form格式错乱

<script>
    import axios from 'axios'
    import qs from 'qs';

    export default {
        name: 'Action',
        data() {
            return {
                phone_wid: "",
                openid: ""
            }
        },
        methods: {
            onSubmit() {
                this.openid = ""
                const url = "/go_action"
                let param = {
                    'serviceName': '***',
                    'methodName': '**',
                    'paramterInput': `{\"appid\":'****',\"is_needTag\":false,\"pid\":**,\"source\":1,\"wid\":${this.phone_wid}}`
                }
                let data = qs.stringify(param)
                console.log(data)
                axios.post(url, data,
                    {
                        headers: {
                            'apiclient-auth': '******',
                            'Content-Type': 'application/x-www-form-urlencoded'
                        }
                    }
                ).then((res) => {

                    console.log(res.data.responseVo.infos[0].openid)
                    this.openid = res.data.responseVo.infos[0].openid
                })
            }

        }
    }
</script>