nl_tokens: Do request
pl_tokens: function doRequest ( reqOpts ) { reqOpts = Object . assign ( { } , reqOpts ) ; if ( currRequestNum >= requestMaxNum ) { return <mask> Promise ( ( resolve , reject ) => { waitingQueues . push ( { options : reqOpts , resolve , reject } ) ; } ) ; } currRequestNum ++ ; let rawComplete = reqOpts . complete ; reqOpts . complete = function ( ... args ) { currRequestNum -- ; rawComplete && rawComplete ( ... args ) ; if ( ! waitingQueues . length ) { return ; } let processReqInfo = waitingQueues . shift ( ) ; doRequest ( processReqInfo . options ) . then ( res => processReqInfo . resolve ( res ) , err => processReqInfo . reject ( err ) ) ; } ; return rawRequest ( reqOpts ) ; }