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ngBind ??? Angular??
??? HTML ??? ??? ???? ??? ???? ??? ????
?? ???? ?? ???? ??? ??? ???????.ngBind attribute tells Angular to replace the text content of the
specified HTML element with the value of a given expression, and to
update the text content when the value of that expression changes.

意思就是ngBind會(huì)告訴angular去將你寫的表達(dá)式替換成一個(gè)特殊的html元素。

而這個(gè)特殊的html元素就是那個(gè)帶class的span了，

雙花括號(hào){{}}和ngBind是一樣的，實(shí)際上是一個(gè)directive

AngularJs ng-bind? HTML ? ??? ??? 4? ????. ??? ??? ?? ?? ??? ????? ??????

a? ??? ?? ??? ??????
????? $scope.a=4;
{{a}}? ?? ??? 4???.

?????? ?????. ?? https://github.com/angular/angular.js/blob/master/src/ng/compile.js#L1...
?? ???? ? ? ????. ??? ? "??? ??? ??"? ???? ????? ? ?????