speed test js

speedtest.js

function mitt(all) {
  all = all || Object.create(null)
  return {
    on(type, cb){
      (all[type] || (all[type] = [])).push(cb);
    },
    off(type, cb){
 			if (all[type]) {
				all[type].splice(all[type].indexOf(cb) >>> 0, 1);
			}
    },
    emit(type, evt){
			(all[type] || []).map(cb => { cb(evt); });
			(all['*'] || []).map(cb => { cb(type, evt); });
    }
  }
}
/*
 * usage:
 * const speed = speedTest(function(result){
 *   console.log(result)
 * })
 * speed({url: 'domain.com', method: 'get'})
 * 
*/
function speedTest(cb){
  const o = mitt();
  o.on('finish', cb);
  return function(options) {
	  const client = new XMLHttpRequest();
	  let startTime = null
	  client.onreadystatechange = function() {
	     switch(client.readyState) {
		case 1: /* Opened */
		    startTime = Date.now();
		    break;
		    
		     case 4:
			     if (client.status == 200) {
  console.log('finish')
			     }
			     break;
	    }
	  }
	  client.open(options.method, options.url);
	  client.send(null);
  }
}