是否angularjs treates null作为$ scope.null？ [英] Does angularjs treates null as $scope.null?

问题描述

举例问题

<div ng-show="bar !== null">hello</div>

这是在范围评为

$scope.bar !== null

或者是因为这？

$scope.bar !== $scope.null

请注意，在最后一种情况下，$ scope.null将是不确定的和例子似乎工作的权利。

Note that in last case, $scope.null would be undefined and the example would seem to work right.

奖励：

如果巴= null，则发生这种情况。

if bar = null then this happens

// this does not work (shows hello)
<div ng-show="bar !== null">hello</div>

不给相同的结果

// this works ok (does not show hello)
<div ng-show="bar != null">hello</div>

为什么会发生呢？

why does that happen?

推荐答案

没有，角<一个href=\"https://github.com/angular/angular.js/blob/71fc3f4fa0cd12eff335d57efed7c033554749f4/src/ng/parse.js#L594\"相对=nofollow>识别在EX pressions一些JS原语和空就是其中之一。

No, Angular recognizes some JS primitives in expressions, and null is among them.

这篇关于是否angularjs treates null作为$ scope.null？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！