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877acb5a8f055037126d3f2b441f820c20dad201
front-end-example/03-javascript-core/08-built-in-methods/README.md
charlie 877acb5a8f feat: Add JavaScript core exercises and solutions 
- Implemented exercises for array high-order methods, memory and execution, switch statements, and final review.
- Added starter and answer files for each exercise to facilitate learning.
- Created a runner HTML file to execute JavaScript code and display console outputs.
- Updated README files to include exercise objectives, tasks, and usage instructions.
2026-03-13 11:09:19 +08:00

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练习 8：常见内置方法

目标

学会使用几个常见的字符串和数组方法，减少重复代码。

你要练什么

  • trim()
  • toUpperCase()
  • includes()
  • join()

任务

请完成一个“标签清洗器”脚本，要求：

  • 把一段带空格的文本去掉首尾空格
  • 把结果转成大写
  • 判断里面是否包含 JS
  • 把一个标签数组拼成一个字符串输出

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