# **Hiểu đơn giản về Event Loop trong JavaScript** JavaScript là **ngôn ngữ đơn luồng (single-thread)** — chỉ có **một Call Stack** nên tại một thời điểm chỉ xử lý **một tác vụ**. Nếu một hàm chạy quá lâu, chương trình sẽ bị “đứng”. Để tránh điều đó, **trình duyệt cung cấp Web APIs** (như `setTimeout`, `fetch`, `DOM Event`...) giúp JavaScript xử lý **bất đồng bộ**, cho phép các tác vụ tốn thời gian chạy nền mà không chặn luồng chính. ⚙️ **Quy trình hoạt động** 1. **Khi gọi một hàm**, nó được đưa
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