onchange[object]＝null

effectiveType[string]＝4g

rtt[number]＝150

downlink[number]＝1.7

saveData[boolean]＝false

addEventListener[function]＝function addEventListener() { [native code] }

dispatchEvent[function]＝function dispatchEvent() { [native code] }

removeEventListener[function]＝function removeEventListener() { [native code] }