Yanqi Zong xiaoyu2er

前端异常监控

如今Web庞大复杂应用场景广泛，再加上各种浏览器造成的环境差异，很难保证我们的页面呈现给每个用户时都是正常的。稳定和准确是每个产品的基础，对于用户直接交互的页面更加显得重要。我们不能等到用户投诉后才知道出现问题，而是应该主动监控尽快暴露出异常。

AngularJS offers a single framework that can be used to build dynamic, client-centric applications. It provides:

	/**
	* Get a Google auth token given service user credentials. This function
	* is a very slightly modified version of the one found at
	* https://community.cloudflare.com/t/example-google-oauth-2-0-for-service-accounts-using-cf-worker/258220
	*
	* @param {string} user the service user identity, typically of the
	* form [user]@[project].iam.gserviceaccount.com
	* @param {string} key the private key corresponding to user
	* @param {string} scope the scopes to request for this token, a
	* listing of available scopes is provided at

	function interceptNetworkRequests(ee) {
	const open = XMLHttpRequest.prototype.open;
	const send = XMLHttpRequest.prototype.send;

	const isRegularXHR = open.toString().indexOf('native code') !== -1;


	// don't hijack if already hijacked - this will mess up with frameworks like Angular with zones
	// we work if we load first there which we can.
	if (isRegularXHR) {

	addEventListener('fetch', event => {
	event.respondWith(handleRequest(event))
	})

	/**
	* Entry point of the worker
	*/
	async function handleRequest(event) {
	try {
	// Get the JWT