Use zone.js to detect current execution context from anywhere?

问题

With zone.js is it possible to determine the current execution context from anywhere? Ie., if a zone-bound function calls another function which calls setTimeout(myFn) can I determine the current execution context from within myFn()? If so, please provide a simple example of how to do so.

回答1:

Every time you fork() a zone, accessing the zone object within that zone's context will always return the forked zone.

The following experiment demonstrates this behavior:

var b = function() { console.log('-->',zone) }; 
var a = function() { setTimeout(b,5); }; 
zone.fork().run(function() { zone.x = 'hi'; a(); }); 
setTimeout(function() { console.log('==>', zone); }, 1);
setTimeout(function() { console.log('==>', zone); }, 10);

Here's what happens when you paste it into the console:

来源：https://stackoverflow.com/questions/27164756/use-zone-js-to-detect-current-execution-context-from-anywhere