代码：

/**
 * 上传图片到服务器
 * [@param](/user/param) filePath
 */
uploadFileToServer: async function(filePath) {
    const {address} = this.data;
    const {extData = {}} = this.properties;
    const formData = {...address, ...extData};
    const AuthenToken = await getCookie(COOKIE_KEY_TOKEN);
    const commHeader = await getCookie(COOKIE_KEY_COMM_HEADER);
    const url = baseUrl  + uploadCertImg + "?" + Object.keys(formData).map(key => key + "=" + formData[key]).join("&");
    wx.uploadFile({
        url,
        filePath,
        name: 'file',
        header: {
            AuthenToken,
            ...commHeader,
            "Content-Type": "multipart/form-data;charset=UTF-8"
        },
        success: (res) => {
            const data = JSON.parse(res.data || "{}");
            const {code, data: imgData, status, exception, msg} = data;
            const {picUrl} = imgData;
            if (code !== 0) {
                this.uploadFail(msg);
            } else {
                this.changeImage(picUrl, imgData);
            }
        },
        fail: err => this.uploadFail((err || {}).errMsg),
        complete: () => this.hideLoading()
    })
},