Javascript 如何从 angular.js 的作用域中“删除”一个变量
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How to "delete" a variable from scope in angular.js
提问by Kiran Yallabandi
According to my knowledge when we attach a variable to the scope , watches are applied to it and it is checked every digest cycle. A good rule of thumb is that we should not have more than 2000 variables being watched at a given time.
根据我的知识，当我们将变量附加到 scope 时，会对其应用监视，并在每个摘要周期检查它。一个好的经验法则是，在给定时间我们不应有超过 2000 个被监视的变量。
My question is how do you remove an already present variable from scope. For example $scope.var1=1say I had to create it for a one time use. Is it possible for me to "delete" it from the scope or will the variable be watched for the life time of the scope ?
我的问题是如何从作用域中删除已经存在的变量。例如$scope.var1=1说我必须创建它以供一次性使用。我是否可以从作用域中“删除”它，还是会在作用域的生命周期内监视变量？
EDIT :
编辑 ：
From the comments below I understand that you are supposed to remove the watches manually or they get destroyed when the scope gets destroyed. However I am still unclear as to how will you remove watches for variables which are set by directives such as ngModel ?
从下面的评论中，我了解到您应该手动移除手表，否则它们会在范围被破坏时被破坏。但是，我仍然不清楚您将如何删除由 ngModel 等指令设置的变量的监视？
回答by aghidini
You can simply use the deletekeyword:
您可以简单地使用delete关键字：
delete $scope.var1;
