Angularjs - what does it mean: mean?

Question

In some angular js files, I see the syntax below. What does double :: "mean" mean?

<span>{{::x}}</span>
<div>{{::y.z()}}</div>

Answer 1

This feature is called unidirectional data binding and comes with Angular 1.3 . For older versions, there is an equivalent add-in called bindonce .

From Angular JS Documentation :

An expression starting with :: is considered a one-time expression. Disposable expressions cease to be recounted as soon as they are stable, which happens after the first digest if the result of the expression is undefined

, :

{{::x}}

Angular , x. , x , .

Answer 2

, angular js 1.3 +

{{:: title}}

, , . Doc

Answer 3

. , . . :

https://www.binpress.com/tutorial/speeding-up-angular-js-with-simple-optimizations/135