优化

‘liusuyi’

2023-10-21 ae92b6823499cfab77201b4033922fa373fb37a3

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'use strict';
 
var inherits = require('inherits')
  , AjaxBasedTransport = require('./lib/ajax-based')
  , EventSourceReceiver = require('./receiver/eventsource')
  , XHRCorsObject = require('./sender/xhr-cors')
  , EventSourceDriver = require('eventsource')
  ;
 
function EventSourceTransport(transUrl) {
  if (!EventSourceTransport.enabled()) {
    throw new Error('Transport created when disabled');
  }
 
  AjaxBasedTransport.call(this, transUrl, '/eventsource', EventSourceReceiver, XHRCorsObject);
}
 
inherits(EventSourceTransport, AjaxBasedTransport);
 
EventSourceTransport.enabled = function() {
  return !!EventSourceDriver;
};
 
EventSourceTransport.transportName = 'eventsource';
EventSourceTransport.roundTrips = 2;
 
module.exports = EventSourceTransport;