几个问题：

1. Access-Control-Allow-Origin header在您的 * request * 中没有位置，因为它是一个 * response * 报头。
   1.如果你想让你的客户端访问响应，你不能使用no-cors模式，你必须使用cors模式（这是跨源请求的默认模式）。
   1.因为所讨论的资源似乎不允许任何请求头文件，除了 * CORS安全列表的请求头文件 *，您将无法在请求中包含Content-Type头文件。但请注意，所讨论的请求是GET，对于它来说，包含Content-Type头文件是没有意义的。因为GET请求并不意味着有一个主体，所以只需从请求中删除该标头即可。
   如果你解决了所有三个问题，它应该工作。

不需要设置cors选项
我将通过axios调用显示两个选项。两者的结果相同
选项1：使用create（）

const axios = require("axios")

const token ='<your token>'
const api = axios.create({baseURL: `https://trefle.io/api/v1/plants/?token=${token}`});

try {
    api.get().then((results) => {
        for (plant of results.data.data) { 
            console.log(JSON.stringify(plant))
        }
    })
} catch (error) {
    console.log(error)
}

选项2：不创建（）

const axios = require("axios")

const getPlants = async () => {
    try {
        const token ='<your token>'
        const response = await axios.get(`https://trefle.io/api/v1/plants?token=${token}`);
        return Promise.resolve(response.data);
    } catch (error) {
        return Promise.reject(error);
    }
}

getPlants()
    .then(plants => {
        for (plant of plants.data) { 
            console.log(JSON.stringify(plant))
        }
}).catch(error => console.log(error));

结果1

$ node get-option1.js
{"id":77116,"common_name":"Evergreen oak","slug":"quercus-rotundifolia","scientific_name":"Quercus rotundifolia","year":1785,"bibliography":"Encycl. 1: 723 (1785)","author":"Lam.","status":"accepted","rank":"species","family_common_name":null,"genus_id":3519,"image_url":"https://d2seqvvyy3b8p2.cloudfront.net/40ab8e7cdddbe3e78a581b84efa4e893.jpg","synonyms":["Quercus ilex var. oleoides","Quercus ilex subvar. rotundifolia","Quercus ilex f. macrophylla","Quercus ilex f. oleoides","Quercus ilex var. calicina","Quercus ilex subsp. rotundifolia","Quercus lyauteyi","Quercus ballota var. rotundifolia","Quercus ilex f. brevicupulata","Quercus ilex subvar. major","Quercus ilex var. pendula","Quercus rotundifolia f. dolichocalyx","Quercus calicina","Quercus rotundifolia f. pilosella","Quercus rotundifolia f. macrocarpa","Quercus ilex var. rotundifolia","Quercus sugaro","Quercus ilex subvar. pendula","Quercus ilex f. pendula","Quercus ilex f. ballota","Quercus ilex f. rotundifolia","Quercus ilex subvar. minor","Quercus ballota","Quercus ilex var. ballota","Quercus ilex f. calicina","Quercus ilex var. microcarpa","Quercus rotundifolia f. calicina","Quercus ilex f. macrocarpa","Quercus rotundifolia f. brevicupulata","Quercus rotundifolia var. macrocarpa","Quercus ilex var. brevicupulata","Quercus ilex subsp. ballota","Quercus ilex var. dolichocalyx","Quercus rotundifolia var. pilosella","Quercus rotundifolia var. brevicupulata","Quercus rotundifolia subsp. maghrebiana"],"genus":"Quercus","family":"Fagaceae","links":{"self":"/api/v1/species/quercus-rotundifolia","plant":"/api/v1/plants/quercus-rotundifolia","genus":"/api/v1/genus/quercus"}}

... cut off

结果二

$ node get-option2.js
{"id":77116,"common_name":"Evergreen oak","slug":"quercus-rotundifolia","scientific_name":"Quercus rotundifolia","year":1785,"bibliography":"Encycl. 1: 723 (1785)","author":"Lam.","status":"accepted","rank":"species","family_common_name":null,"genus_id":3519,"image_url":"https://d2seqvvyy3b8p2.cloudfront.net/40ab8e7cdddbe3e78a581b84efa4e893.jpg","synonyms":["Quercus ilex var. oleoides","Quercus ilex subvar. rotundifolia","Quercus ilex f. macrophylla","Quercus ilex f. oleoides","Quercus ilex var. calicina","Quercus ilex subsp. rotundifolia","Quercus lyauteyi","Quercus ballota var. rotundifolia","Quercus ilex f. brevicupulata","Quercus ilex subvar. major","Quercus ilex var. pendula","Quercus rotundifolia f. dolichocalyx","Quercus calicina","Quercus rotundifolia f. pilosella","Quercus rotundifolia f. macrocarpa","Quercus ilex var. rotundifolia","Quercus sugaro","Quercus ilex subvar. pendula","Quercus ilex f. pendula","Quercus ilex f. ballota","Quercus ilex f. rotundifolia","Quercus ilex subvar. minor","Quercus ballota","Quercus ilex var. ballota","Quercus ilex f. calicina","Quercus ilex var. microcarpa","Quercus rotundifolia f. calicina","Quercus ilex f. macrocarpa","Quercus rotundifolia f. brevicupulata","Quercus rotundifolia var. macrocarpa","Quercus ilex var. brevicupulata","Quercus ilex subsp. ballota","Quercus ilex var. dolichocalyx","Quercus rotundifolia var. pilosella","Quercus rotundifolia var. brevicupulata","Quercus rotundifolia subsp. maghrebiana"],"genus":"Quercus","family":"Fagaceae","links":{"self":"/api/v1/species/quercus-rotundifolia","plant":"/api/v1/plants/quercus-rotundifolia","genus":"/api/v1/genus/quercus"}}
... cut off

有人能花点时间解释一下为什么我的代码不起作用吗？

const axiosInstance = axios.create({
    baseURL : `https://trefle.io/api/v1/plants?token=${token}`,
})

actions:{
        async getPlantsList(context)
        {
            try{
                console.log(axiosInstance);        
                const response = await axiosInstance.get();

                console.log('2', response.data);
                context.commit();

            } catch(error){
                console.log('error', error);
            }
        }