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README.md

练习 4：点击计数器

目标

学会给按钮绑定点击事件，并更新页面数据。

你要练什么

  • addEventListener
  • 点击事件
  • 数字状态更新
  • DOM 渲染

任务

  • 点击加一按钮时计数加 1
  • 点击减一按钮时计数减 1
  • 点击重置按钮时恢复为 0

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