用纯JS把iconfont.cn的图标转换成RN组件，不依赖字体，支持多色彩，支持热更新
yarn add react-native-svg
yarn add react-native-iconfont-cli --dev
npx iconfont-init
{
"symbol_url": "请参考README.md，复制官网提供的JS链接",
"use_typescript": false,
"save_dir": "./src/iconfont",
"trim_icon_prefix": "icon",
"default_icon_size": 18,
"local_svgs": "./localSvgs"
}
npx iconfont-rn
