JavaScript 模板字符串

✏️ Editable

Loading...

Live Preview

⌘+Enter Run⌘+R Reset

Current StepStep 1/3

Unlocked Steps1/3

Next Suggestion

Complete current Step 1 first

1) Current Task & Steps

Current task: Step 1 - 用户介绍文案
实现 formatIntro(name, role)，返回 "I am {name}, a {role}."

Write your code in `script.js` for the current Step.
Click "Run Validation" to check if rules pass.
Once current Step passes, the next step unlocks automatically.
You need to pass Step 1 first to unlock Step 2.

Step Deliverables (Check these)

Define function: formatIntro(name, role)
Self-check: formatIntro("Amy", "Designer") => "I am Amy, a Designer."

2) Beginner Explanation (Current Step)

Step task: 实现 formatIntro(name, role)，返回 "I am {name}, a {role}."
Define function(s): formatIntro, then verify results with test inputs.
This step has a specific expected result. Focus on making the function return the correct value.
A function is a reusable block of code. Define it first, then call it.
`return` sends a result back. Without return, you usually can't get the function's result.

3) Starter Template (Type along)

function formatIntro(name, role) {
  return null;
}
// Self-check: formatIntro("Amy", "Designer") should return "I am Amy, a Designer."
console.log(formatIntro("Amy", "Designer"));

4) Rule Validation & Hints

📋 当前任务 - Step 1

定义 formatIntro 函数
formatIntro("Amy","Designer") 返回正确

🔐 学习提示

📖 快速参考

模板字符串可明显减少字符串拼接噪音，让文案和变量关系更直观。

About This Exercise

模板字符串（反引号）就是更好读的字符串拼接方式。

新手常见写法是 "a" + name + "b"，这关会把它升级成更直观的写法。

Beginner⏱ 15-20 min

Learning Objectives

使用反引号创建模板字符串
在字符串中插入变量和表达式
将传统拼接改写为 ES6 风格

Scenario

你正在编写一个用户信息卡片模块，需要动态拼接展示文案。用模板字符串可以让代码更可读且更容易维护。

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

All rules for the current step passCan explain each line of your codeCan name a real-world business scenario for this

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?

Not confident yet, need more practiceCan complete similar tasks independentlyCan teach others how to do it