JavaScript 迭代器与生成器
✏️ Editable
Loading...
Live Preview
⌘+Enter Run⌘+R Reset
About This Exercise
生成器（generator）可以理解成“按需发货机”：你取一次，它产出一个值。
这在大列表、分页数据、数据流处理中很常见。
本关只练三件事：基础产出、基于产出筛选、按步长产出。
Intermediate⏱ 20-25 min
Learning Objectives
- 掌握 function* 与 yield 的基础语法
- 学会把生成器结果转成数组使用
- 理解按需产出的性能意义
Scenario
你在处理分页或流式数据，希望按顺序逐个拿值，再做筛选和步长控制。
这正是 generator 的典型场景。
Why Do This
- Frontend JS is not just about knowing the syntax — the key is reliably manipulating the DOM and managing interaction state.
- Break down the event flow (trigger -> handle -> update UI) before coding, and you will make significantly fewer errors.
- Rule-based validation helps you develop a testable frontend mindset.
Hands-on Practice
- Write out the event flow in comments first, then implement the functions.
- Add an edge case branch for invalid input or empty data.
- Explain why each validation rule is needed.
Common Mistakes
- Only testing the happy path without verifying edge inputs or repeated clicks.
- Mixing event binding and state updates together, making future maintenance difficult.
- Console output looks correct but the UI is not actually updated.
Deliverable
A reusable interaction component scaffold (event flow description + key functions + edge case handling).
My Progress
Completed Steps0 / 3
Total Attempts0
Best Score0%
Completion Criteria (Checkable)
Confirm before completing this Lab
Reflection Questions (Recommended)
Describe the event flow of this Lab in 2-3 sentences (trigger -> handle -> update).
What edge case did you add? Why is it easy to miss?
How confident are you with this interaction pattern now?
Tags
JavaScriptES6IteratorGenerator