示例:图片库指令检索图片并将它们传递给范围:
var galleryBootstrapData = bootstrapDataService.get('galleryBootstrapData');
$scope.galleryPictures = galleryBootstrapData.pictures;
图片库模板渲染图片和图片数量如下图:
<div ng-if="galleryPictures.length && galleryPictures.length>0" >{{galleryPictures.length}}</div>
从模板中检查未定义的范围变量是一种好习惯吗?