AngularJS 表达式（{{ expression }}）类似于 AngularJS ng-bind
例子：
<span>表达式</span> <div ng-app="" ng-init="quantity=1;cost=5"> <p>总价： {{ quantity * cost }}</p> </div> <span>ng-bind：</span> <div ng-app="" ng-init="quantity=1;cost=5"> <p>总价： <span ng-bind="quantity * cost"></span></p> </div>
原文：http://www.cnblogs.com/IKang8701348/p/6247373.html