波斯汪
用三目运算符。使用ng-switch结构。使用ng-if。angularjs中的判断语句说明。由于angularjs不支持if-else结构，所以判断的写法如下：用三目运算符：<span>{{isLarge ? 'video.large' : 'video.small'}}</span>使用ng-switch结构：<div ng-switch on="video"><div ng-switch-when="video.large"></div><div ng-switch-default><!-- code to render the regular video block --></div></div>使用ng-if（angularjs 1.1.5以后版本有效）：<div ng-if="video == video.large"><!-- code to render a large video block--></div><div ng-if="video != video.large"><!-- code to render the regular video block --></div>