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# Build Optimization
## 构建优化
优化 UniApp + uView 项目的构建和性能。
### 代码分割
使用条件编译减少代码体积:
```vue
<template>
<view>
<!-- #ifdef H5 -->
<u-button>H5 按钮</u-button>
<!-- #endif -->
<!-- #ifdef MP-WEIXIN -->
<u-button>小程序按钮</u-button>
<!-- #endif -->
</view>
</template>
```
### 组件按需引入
虽然 easycom 会自动引入,但可以优化:
```json
{
"easycom": {
"autoscan": true,
"custom": {
"^u-(.*)": "uview-ui/components/u-$1/u-$1.vue"
}
}
}
```
### 图片优化
```vue
<template>
<view>
<!-- 使用 webp 格式H5 -->
<!-- #ifdef H5 -->
<image src="/static/image.webp"></image>
<!-- #endif -->
<!-- 使用 png 格式小程序 -->
<!-- #ifdef MP-WEIXIN -->
<image src="/static/image.png"></image>
<!-- #endif -->
</view>
</template>
```
### 样式优化
```vue
<style lang="scss" scoped>
/* 使用 scoped 避免样式污染 */
.container {
/* 样式 */
}
</style>
```
### 打包配置
在 manifest.json 中配置打包选项:
```json
{
"mp-weixin": {
"setting": {
"minified": true,
"postcss": true
}
},
"h5": {
"optimization": {
"treeShaking": {
"enable": true
}
}
}
}
```
### 注意事项
1. **条件编译**:使用条件编译减少代码体积
2. **图片优化**:使用合适的图片格式和大小
3. **样式优化**:使用 scoped 避免样式污染
4. **打包配置**:正确配置打包选项
5. **性能测试**:在不同平台测试性能