fix: 🐛 修复Textarea的placeholder无法设置空字符串问题

[skiyee]

✅ Closes: #471

🤔 这个 PR 的性质是？(至少选择一个)

• 日常 bug 修复
• 新特性提交
• 站点、文档改进
• 演示代码改进
• 组件样式/交互改进
• TypeScript 定义更新
• CI/CD 改进
• 包体积优化
• 性能优化
• 功能增强
• 国际化改进
• 代码重构
• 代码风格优化
• 测试用例
• 分支合并
• 其他改动（是关于什么的改动？）

🔗 相关 Issue

#471

💡 需求背景和解决方案

更改判断方式，不再过滤空字符串

☑️ 请求合并前的自查清单

⚠️ 请自检并全部勾选全部选项。⚠️

• 文档已补充或无须补充
• 代码演示已提供或无须提供
• TypeScript 定义已补充或无须补充

Summary by CodeRabbit

• 新特性
  • 修改了 wd-textarea 组件的占位符处理逻辑，确保有效的空字符串保留，而仅在占位符为 null 或 undefined 时回退到翻译函数，从而提升了用户体验。

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Name	Status	Preview	Comments	Updated (UTC)
wot-design-uni	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 31, 2024 3:54am

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Name	Link
🔨 Latest commit	28a0599

[coderabbitai]

Walkthrough

此次更改优化了 wd-textarea 组件的占位符处理方式。通过将占位符赋值逻辑从逻辑或运算符 || 修改为使用计算属性与空值合并运算符 ??，确保只有在占位符明确为 null 或 undefined 时，才回退到翻译后的默认占位符。这一调整提升了用户体验，允许有效的空字符串作为有效输入，从而保留用户的意图。

Changes

文件	修改摘要
src/uni_modules/wot-design-uni/components/wd-textarea/wd-textarea.vue	修改占位符处理方式，采用计算属性和空值合并运算符 ??，确保有效空字符串不被替换为默认占位符。

Assessment against linked issues

目标	已解决	解释
wd-textarea的placeholder无法设置为空值 (#471)	✅

Poem

在草地上跳跃的小兔子，
占位符变得更聪明，
空字符串也能自由飞，
用户体验更添光辉，
让我们一同欢呼庆祝吧！🐰✨

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[coderabbitai]

Actionable comments posted: 0

Review details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between b0e4d23 and 162e40a.

Files selected for processing (1)

• src/uni_modules/wot-design-uni/components/wd-textarea/wd-textarea.vue (1 hunks)

Additional comments not posted (1)

src/uni_modules/wot-design-uni/components/wd-textarea/wd-textarea.vue (1)

20-20: 更改占位符逻辑以允许空字符串

将占位符逻辑从逻辑或运算符 || 修改为空值合并运算符 ?? 是一个明智的选择。这确保了占位符仅在明确为 null 或 undefined 时才回退到翻译后的默认值，而不是在遇到空字符串时。

[coderabbitai]

Actionable comments posted: 0

Review details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between 162e40a and 28a0599.

Files selected for processing (1)

• src/uni_modules/wot-design-uni/components/wd-textarea/wd-textarea.vue (3 hunks)

Files skipped from review as they are similar to previous changes (1)

• src/uni_modules/wot-design-uni/components/wd-textarea/wd-textarea.vue