我的語法有什么問題？它拋出一個錯誤：Scraping failed Error: Evaluation failed: ReferenceError: getLogo is not defined代碼片段：      const universityAtt = await page.evaluate(() => {            // Getting total number of universities            let totalUniversities = document.querySelector('ul.universities-search-result').childElementCount            for (i = 0; i < totalUniversities; i++) {                getLogo += document.querySelectorAll('.profile_lead > .dp > img.logo-90x90')[i].src;                universityURL += document.querySelectorAll('a.profile.adv, a.profile.basic')[i].href;                let x = [getLogo, universityURL];            };            return x;        });編輯 (1) 當我聲明 getLogo 和 universityURL 變量時，        const universityAtt = await page.evaluate(() => {            // Getting total number of universities            let totalUniversities = document.querySelector('ul.universities-search-result').childElementCount            for (i = 0; i < totalUniversities; i++) {                let getLogo += document.querySelectorAll('.profile_lead > .dp > img.logo-90x90')[i].src;                let universityURL += document.querySelectorAll('a.profile.adv, a.profile.basic')[i].href;                let x = [getLogo, universityURL];            };            return x;        });我收到此錯誤：SyntaxError: Unexpected token '+='    at wrapSafe (internal/modules/cjs/loader.js:1116:16)    at Module._compile (internal/modules/cjs/loader.js:1164:27)    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1220:10)    at Module.load (internal/modules/cjs/loader.js:1049:32)    at Function.Module._load (internal/modules/cjs/loader.js:937:14)    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)    at internal/main/run_main_module.js:17:47