angular.js - Sometimes you need to add {{}} in the ng tag, sometimes you need {}, and sometimes you don't need braces. Are there any rules?

Question

To bind the value in $scope in ng-bind, you need to write {{}}
To bind the value in $scope in ng-src, you need to write {{}}
You don’t need to write {{}}
to determine true or false in ng-checked. In ng-class, you need to write {}

to determine true or false.

When do you need {{}} and when do you need {}? Are there any rules for this?

Answer 1

You remember one thing, as long as it is ng-开关的指令，大都是不需要写的。ng-srcexcept.

ng-src 为什么要呢？主要是因为不能直接用 src ，它会直接请求，不等待 Angular 解析 {{}} ，而 ng-src Mainly to achieve effects similar to this:

<img ng-src="http://www.gravatar.com/avatar/{{hash}}" alt="Description" />

So, that’s it.

ng-class实际上是需要你提供一个对象，所以使用 {} to construct.