clean static method
删除缓存图片
Implementation
static void clean(String url, {String? cacheKey, String? cacheTag}) {
var img = url;
if (kWebImagePrefix != null && !img.startsWith("http")) {
img = getJoin(kWebImagePrefix!, img);
}
clearDiskCachedImage(img, cacheKey: keyToTagMd5(img, cacheKey, cacheTag));
}