<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> </head> <body> <script> (function () { let ctnTimer; function a() { let urls = [{ file: "a" }] setTimeout(()=>{ urls.forEach(item=>{ item.js = "1111"; }) },500) b() function b() { if (urls.some(function (url) { return !url.js; })) { if (!ctnTimer) clearTimeout(ctnTimer); ctnTimer = setTimeout(b, 500); return; } else { console.log("1111111"); c(); } } } function c(){ console.log("32222222222") } a(); })() </script> </body> </html>