代碼顯示錯誤 await 只能在異步 function 中聲明，盡管存在異步 function

Question

下面的代碼從數據庫中獲取 url 和 article_id。 它爬取 url 頁面，拍攝 url 中存在的圖像快照並將其保存在我的遠程服務器中。

PS：javascript的菜鳥！

(async () => {
client.query("SELECT DISTINCT url,article_id FROM public.content_paraarticle",(err,res,fields)=>{
if (err)  throw err;
// console.log(res)
for(var i=0;i<res.rows.length;i++)
{

// Set up browser and page.
    const browser = await puppeteer.launch({headless: false});
    const page = await browser.newPage();
    page.setViewport({ width: 1280, height: 926 });
    var str1='.png';


    // arr.push(res[i])
    var id=(res.rows[i].article_id);
    var str=id+str1;
    console.log(str);
    var url=(res.rows[i].url);

    console.log('taken');
    await Promise.race([
    await page.goto('https://www.thehindu.com/news/cities/kozhikode/skilled-entrepreneurs-centres-in-35-panchayats-in-kozhikode/article29434054.ece?utm_source=udmprecommendation_other-states&utm_medium=sticky_footer&transactionId=5abd798d30a44245b32a3fde2925c44d', {waitUntil: 'load'}),
    new Promise(x => setTimeout(x, 60000)),
    ]);

    const Image = await page.$('body > div.container-main > div.jscroll > div > div > div > section > div > div > div > div:nth-child(2) > div.lead-img-cont > div > picture > img');
    console.log('screenshot started to get taken');
    const shot=await Image.screenshot({
    path: str,
    omitBackground: true,
    });
    console.log('screenshot taken');
    await browser.close();



}
client.end()
});

})();

Answer 1

您已將 function 傳遞給client.query ，並且您的等待調用在 function 中，因此您需要使 function 異步。

 client.query("SELECT DISTINCT url,article_id FROM public.content_paraarticle", 
               async (err,res,fields) => {
               // your await calls 
              }