ngx.shared.DICT.get_keys ------------------------ **语法:** *keys = ngx.shared.DICT:get_keys(max_count?)* **环境:** *init_by_lua*\**, set_by_lua*\**, rewrite_by_lua*\**, access_by_lua*\**, content_by_lua*\**, header_filter_by_lua*\**, body_filter_by_lua*\**, log_by_lua*\**, ngx.timer.*\* 获取字典中存储的 key 列表，最多 `<max_count>` 个。 默认时，前 1024 个 key (如果有) 被返回。当参数 `<max_count>` 值为 `0` 时，字典中所有的 key 被返回，即使超过 1024 个。 **警告** 在包含非常多 key 的字典中调用此方法要非常小心。此方法会锁定字典一段时间，会阻塞所有访问字典的 nginx worker 进程。 这个功能最早出现在 `v0.7.3` 版本中。 > English Source **syntax:** *keys = ngx.shared.DICT:get_keys(max_count?)* **context:** *init_by_lua*\**, set_by_lua*\**, rewrite_by_lua*\**, access_by_lua*\**, content_by_lua*\**, header_filter_by_lua*\**, body_filter_by_lua*\**, log_by_lua*\**, ngx.timer.*\* Fetch a list of the keys from the dictionary, up to `<max_count>`. By default, only the first 1024 keys (if any) are returned. When the `<max_count>` argument is given the value `0`, then all the keys will be returned even there is more than 1024 keys in the dictionary. **WARNING** Be careful when calling this method on dictionaries with a really huge number of keys. This method may lock the dictionary for quite a while and block all the nginx worker processes that are trying to access the dictionary. This feature was first introduced in the `v0.7.3` release. [返回目录](#nginx-api-for-lua)