不推荐使用主线程上的Firebase同步XMLHttpRequest
[英]Firebase Synchronous XMLHttpRequest on the main thread is deprecated
问题描述
I am working on a phonegap/cordova ionic app. 
我正在使用phonegap / cordova离子应用程序。 I am testing on iOS and Android. 我在iOS和Android上测试。
On iOS all works well. 在iOS上运行良好。
However on Android, I get the following message when one of my views loads: 但是在Android上，当我的一个视图加载时，我收到以下消息：
Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience.
Each time I get this "warning" - my view does not load. 每次我收到这个“警告” - 我的观点都没有加载。
One of the .lp?dframe=t&id=...&pw=... queries that are to/from firebase has the following: 其中一个.lp？dframe = t＆id = ...＆pw = ...来自/来自firebase的查询具有以下内容：
<html><body><script>
function EnvSendPing(destURL) {
try{
var xhr=new XMLHttpRequest();
xhr.open("GET", destURL, false);
xhr.send(null);
} catch (e) { }
}
function EnvDisconnect() {
EnvSendPing("/.lp?disconn=t&id=294802&pw=LL8E8eo2Rz");
}
if(window.addEventListener)
window.addEventListener('unload',EnvDisconnect,false);
else if(window.attachEvent)
window.attachEvent('onunload',EnvDisconnect);
</script></body></html>
which clearly has the xhr in as async "false" - causing this "warning". 这显然有xhr in async“false” - 导致这个“警告”。
Is there a way in which I can force ALL Firebase queries to have async true. 有没有办法可以强制所有Firebase查询具有异步true。 If this is just a "warning" why should the page stall? 如果这只是一个“警告”，为什么页面会失速？
Note that on iOS and on Chrome and Safari on the desktop - all works as expected. 请注意，在iOS和桌面上的Chrome和Safari上 - 一切都按预期工作。
1 个解决方案
解决方案1
0 已采纳 2015-07-15 18:43:32
In my case the issue was due to commenting out of cordova.js as suggested by ionic-service-deploy documentation. 在我的情况下，问题是由于离子服务部署文档建议的cordova.js注释。
Uncommenting that, ensures smooth WS connectivity to Firebase. 取消注释，确保与Firebase的WS连接顺畅。 Why it should be such is beyond me - but I have tested by repeatedly adding and removing the include in my index.html to have the effect consistently reproduced on Android/4.4.4 device. 为什么它应该是这样的超出我 - 但我已经通过反复添加和删除我的index.html中的包含测试，以在Android / 4.4.4设备上一致地重现效果。
Hope this is of help to others - I spent a large time finding this out! 希望这对其他人有所帮助 - 我花了很长时间才发现这一点！
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