就在最近，ECMAScript 2026（ES2026）规范正式获批，这是 JavaScript 最新一代语言标准。这意味着：未来几年，浏览器、Node.js、Deno、Bun……都会逐步全面进入 ES2026 时代。 过去几年每次 ECMAScript 发布新版本。 评论区都会出现一句话：JavaScript 又更新了，但我每天还是在写 const。 很多开发者甚至觉得：ES6 之后，JavaS ...

不管你在里面写了什么，只要函数前面挂了 ​​async​​，它的返回值就一定是个 Promise——你可以把 Promise 理解成一张「取货凭条」：活儿还没干完，先给你张条，凭条以后能拿到结果。 周四下午三点，运营小李在后台传了个 3000 行的客户 Excel，点「开始导入」。 不到一秒，弹窗跳出来：导入成功，共 3000 条。 小李截图发群里，配文「新系统真快 🚀」。 二十分钟后，客服群炸 ...

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