Zone 传播 - 异步操作补丁

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小牛编辑

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2023-12-01

Zones 的猴子补丁方法只修补一次。
进入/离开 zone 只需更改Zone.current的值。（不需要进一步的猴子补丁）
Zone.prototype.wrap method provides convenience for wrapping callbacks. (The wrapped callback is executed through Zone.prototype.runGuarded())
Zone.prototype.runGuarded() is just like Zone.prototype.run(), but with extra try-catch block for handling exceptions .


let originalPromiseThen = Promise.prototype.then;
// NOTE: this is simplified as actual API has more arguments.
  // Capture the current zone
  let capturedZone = Zone.current;
  // Return a closure which executes the original closure in zone.
  };
  // Invoke the original callback in the captured zone.
};

Promises handle their own exceptions and so they can’t use Zone.prototype.wrap(). (We could have separate API, but Promise is the exception to the rule, and so I did not feel justified creating its own API.)
Promise API较多，在此示例中未显式显示。