nutui fix: 修复 tour 组件无法根据 current 值展示指定步骤以及 change 事件得到的值有误

这个 PR 做了什么? (简要描述所做更改)

修复了当用户传入 current prop 时无效，组件未对 current 做处理，还修复了 onChange 事件得到的 step 的值计算错误

这个 PR 是什么类型? (至少选择一个)

[ ] feat: 新特性提交
[x] fix: bug 修复
[ ] docs: 文档改进
[ ] style: 组件样式/交互改进
[ ] type: 类型定义更新
[ ] perf: 性能、包体积优化
[ ] refactor: 代码重构、代码风格优化
[ ] test: 测试用例
[ ] chore(deps): 依赖升级
[ ] chore(demo): 演示代码改进
[ ] chore(locale): 国际化改进
[ ] chore: 其他改动（是关于什么的改动？）

这个 PR 涉及以下平台:

[x] NutUI H5 @nutui/nutui
[x] NutUI Taro @nutui/nutui-taro

这个 PR 是否已自测:

[ ] 自测 Vite 脚手架使用测试仓库
[x] 自测 Taro 脚手架使用小程序 & Taro-H5 测试仓库

Summary by CodeRabbit

新功能
- 更新了Tour组件的步骤转换逻辑，提升用户在切换步骤时的流畅度。
代码重构
- 优化了类属性的分配，将动态类绑定改为静态类分配。
- 重构了计算属性，提高了代码可读性和维护性。
样式
- 引入了CSSProperties类型，增强了样式管理的一致性和可控性。

Jul 12 '24 14:07 daiwanxing

Walkthrough

这些更改集中在 src/packages/__VUE/tour/index.taro.vue 文件内，主要涉及模板中类属性的修改，从绑定动态类变为静态类分配。此外，脚本部分引入了 CSSProperties，移除了 classes 计算属性，并对 changeStep 函数进行了控制流增强，以简化步骤转换和事件处理。

Changes

文件路径	更改摘要
src/packages/__VUE/tour/index.taro.vue	修改模板中的类属性分配，增加 `CSSProperties` 导入，移除 `classes` 计算属性，改进 `changeStep` 函数的控制流

Poem

代码如诗，优雅流，
类属性静态有，
脚步轻盈函数走，
风格新颖掌握手。
兔子欢跃庆更改，
未来无限乐陶陶。 🐇✨

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Jul 12 '24 14:07 coderabbitai[bot]

#3138

Jul 12 '24 14:07 daiwanxing

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.18%. Comparing base (a415d0b) to head (5f7c046). Report is 1 commits behind head on v4.

Additional details and impacted files

@@            Coverage Diff             @@
##               v4    #3139      +/-   ##
==========================================
- Coverage   81.20%   81.18%   -0.02%     
==========================================
  Files         226      226              
  Lines       18139    18142       +3     
  Branches     2485     2485              
==========================================
  Hits        14729    14729              
- Misses       3392     3395       +3     
  Partials       18       18

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