javascript - angular $watch的第三个参数scope

问题描述

问 题

$scope.$watch('watchExpression', function(newValue, oldValue, scope) {
            
        }, objectEquality);

第三个scope参数指的什么？

解决方案

$watch(watchExpression, listener, [objectEquality]);
Registers a listener callback to be executed whenever the watchExpression changes.

• The watchExpression is called on every call to $digest() and should return the value that will be watched. (watchExpression should not change its value when executed multiple times with the same input because it may be executed multiple times by $digest(). That is, watchExpression should be idempotent.)

• The listener is called only when the value from the current watchExpression and the previous call to watchExpression are not equal (with the exception of the initial run, see below). Inequality is determined according to reference inequality, strict comparison via the !== Javascript operator, unless objectEquality == true (see next point)

• When objectEquality == true, inequality of the watchExpression is determined according to the angular.equals function. To save the value of the object for later comparison, the angular.copy function is used. This therefore means that watching complex objects will have adverse memory and performance implications.

• The watch listener may change the model, which may trigger other listeners to fire. This is achieved by rerunning the watchers until no changes are detected. The rerun iteration limit is 10 to prevent an infinite loop deadlock.
  If you want to be notified whenever $digest is called, you can register a watchExpression function with no listener. (Be prepared for multiple calls to your watchExpression because it will execute multiple times in a single $digest cycle if a change is detected.)

After a watcher is registered with the scope, the listener fn is called asynchronously (via $evalAsync) to initialize the watcher. In rare cases, this is undesirable because the listener is called when the result of watchExpression didn't change. To detect this scenario within the listener fn, you can compare the newVal and oldVal. If these two values are identical (===) then the listener was called due to initialization.

大兄弟，这是送分题，哈哈
https://docs.angularjs.org/ap...$rootScope.Scope

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