nl_tokens: 如果超过最大缓存数，清理如下请求数据： 1 . 已经请求结束且结束时间超过10秒 2 . 请求#1前面的未结束且未被ui读取过的请求
pl_tokens: function clearCache ( ) { var overflow = frames . length - MAX_FRAMES_LENGTH ; overflow > 0 && frames . splice ( 0 , overflow + 60 ) ; var len = ids . length ; if ( len <= MAX_LENGTH ) { return ; } var now = Date . now ( ) ; var _ids = [ ] ; var preserveLen = len ; overflow = - 1 ; if ( len >= OVERFLOW_LENGTH ) { overflow = len - MAX_CACHE_SIZE ; preserveLen = len - PRESERVE_LEN ; } for ( var i = 0 ; i < len ; i ++ ) { var id = ids [ i ] ; var curData = reqData [ id ] ; if ( i > overflow && ( i >= preserveLen || ( curData . endTime ? now - curData . endTime < CACHE_TIME : now - curData . startTime < CACHE_TIMEOUT ) ) ) { if ( curData . endTime && curData . abort ) { <mask> curData . abort ; } _ids . push ( id ) ; } else { delete reqData [ id ] ; } } ids = _ids ; }