Question

当我在get（）内的finally块中进行console.log记录时，并不是所有应该由helper（）检索的值都不存在。我想这是因为axios方法是异步的。我以为，如果我在helper（）上使用await关键字，它将等待该方法，以便可以打印我想要的所有值，但不会发生。有什么方法可以等待助手方法吗？

(function get() {
    let videoThumbnails = new Array();
    axios.get(urlConstants.latestAnimeUrl)
        .then((res) => {
            if (res.status === 200) {
                const html = res.data;
                const $ = cheerio.load(html);
                const thumbnails = $(".post div a img");
                for (let i = 0; i < thumbnails.length; i++) {
                    let videoThumbnail = new Object;
                    videoThumbnail.thumbnailLink = thumbnails[i].attribs['data-cfsrc']; //image thumbnail link, thumbnail dimensions if needed
                    videoThumbnails.push(videoThumbnail);
                }
                const links = $("a[itemprop=url]")
                links.each(async function (i, elem) {
                    if (i < thumbnails.length) {
                        videoThumbnails[i].thumbnailTitle = $(this).attr("title");
                        await helper($(this).attr("href").toString(),videoThumbnails,i);// link to video webpage, but need actual video link

                    }
                });
            }

        })
        .finally(() => {
            console.log(videoThumbnails);
        });
    return videoThumbnails;
})();

function helper(chiaUrl,videoThumbnails,index) {
     axios.get(chiaUrl)
        .then((response) => {
            if (response.status == 200) {
                const $ = cheerio.load(response.data);
                const videoLink = $("div[id=load_anime] div iframe");
                videoThumbnails[index].thumbnailLink = videoLink.attr("src");    
            }
        })
        .finally(()=> {

        })
}

Answer 1

axios.get返回一个承诺。诺言可以被束缚和等待。您的helper函数返回undefined。您应该返回axios.get

的结果

function helper(chiaUrl,videoThumbnails,index) {
     return axios.get(chiaUrl)
        .then((response) => {
            if (response.status == 200) {
                const $ = cheerio.load(response.data);
                const videoLink = $("div[id=load_anime] div iframe");
                videoThumbnails[index].thumbnailLink = videoLink.attr("src");    
            }
        })
        .finally(()=> {

        })
}

还值得注意的是，如果您在.then内返回内容，那将是等待的结果（这样您就不必传递videoThumbnails并对其进行变异即可获得结果）。

我如何等待axios退回？

1 个答案: