nl_tokens: 请求后的操作
pl_tokens: function ( count ) { var delayMs = count * config . requestTimeout ; if ( this . counted ) { if ( this . getRequestCount && this . saveRequestCount ) return this . saveRequestCount ( count ) . <mask> ( delayMs ) . then ( this . getRequestCount ) . then ( decrement ) . then ( this . saveRequestCount ) ; } return Promise . resolve ( ) ; }