uni-app区分针对不同平台的如何做兼容？如何识别不同平台？ 

app端和微信小程序端
 // #ifdef APP-PLUS || MP-WEIXIN   
this.iconType = ['success', 'success_no_circle', 'info', 'warn', 'waiting', 'cancel', 'download', 'search','clear']
// #endif

仅支付宝小程序端
// #ifdef MP-ALIPAY
this.iconType = ['info', 'warn', 'waiting', 'cancel', 'download', 'search', 'clear', 'success', 'success_no_circle', 'loading']
// #endif

仅百度小程序端
// #ifdef MP-BAIDU
this.iconType = ['success', 'info', 'warn', 'waiting', 'success_no_circle', 'clear', 'search', 'personal', 'setting', 'top', 'close', 'cancel', 'download', 'checkboxSelected', 'radioSelected', 'radioUnselect']
// #endif

仅H5小程序端
// #ifndef H5
this.iconType = ['success', 'info', 'warn', 'waiting', 'success_no_circle', 'clear', 'search', 'personal', 'setting', 'top', 'close', 'cancel', 'download', 'checkboxSelected', 'radioSelected', 'radioUnselect']
// #endif

仅小程序端
// #ifndef MP
this.iconType = ['success', 'info', 'warn', 'waiting', 'success_no_circle', 'clear', 'search', 'personal', 'setting', 'top', 'close', 'cancel', 'download', 'checkboxSelected', 'radioSelected', 'radioUnselect']
// #endif

仅头条抖音小程序端
// #ifdef MP-TOUTIAO
this.iconType = ['success', 'info', 'warn', 'waiting', 'success_no_circle', 'clear', 'search', 'personal', 'setting', 'top', 'close', 'cancel', 'download', 'checkboxSelected', 'radioSelected', 'radioUnselect']
// #endif