如何修改uni-card的样式，例如padding、margin

margin可以通过margin="10px"；padding取了另外一个名字：spacing。所以可以用spacing设置。害，这两个属性不统一名命规则。

要修改 uni-card 的样式（如 padding、margin），可以通过以下几种方式实现：

1. 全局样式覆盖
   在 App.vue 或全局样式文件中添加 CSS 类，覆盖组件默认样式：
   css
   / App.vue 或 uni.scss /
   .uni-card {
   margin: 15px !important; / 修改卡片外部间距 /
   padding: 10px !important; / 修改卡片内部间距 /
   }
2. 局部样式覆盖（推荐）
   在组件内使用 :class 绑定自定义类，避免影响全局样式：
   vue
   <template>
   <view>
   <uni-card :class="['custom-card']">
   <!-- 卡片内容 -->
   </uni-card>
   </view>
   </template>

<style>
/ 自定义卡片样式 /
.custom-card {
margin: 15px;
padding: 10px;
border-radius: 8px;
}
</style>

1. 使用内联样式
   直接通过 style 属性设置具体样式：
   vue
   <uni-card style="margin: 15px; padding: 10px;">
   <!-- 卡片内容 -->
   </uni-card>

2. 自定义主题变量（推荐）
   通过修改 uni.scss 中的主题变量实现全局样式统一：
   scss
   / uni.scss /
   $uni-card-padding: 10px;
   $uni-card-margin: 15px;

注意事项：
使用 !important 时需谨慎，可能导致样式优先级问题
推荐使用自定义类或主题变量，便于维护和统一风格
不同平台可能存在样式差异，建议在各端进行测试

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