The order attribute serves the same purpose as Apache's order directive: it establishes the default behavior and the order in which allow and deny elements are evaluated.
order属性的用途与Apache的order指令相同：它确定缺省行为和计算allow和deny元素的顺序。
AngularJS Directive - How to let an event only be triggered once if otherwise it'll be triggered on multiple elements?
用AngularJS指令-如何让事件只是一次否则它会在多个元素触发触发？
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