ng-repeat 循环数组内元素时，如果数组内元素重复，angular会抛出异常: Error: [ngRepeat:dupes] http://errors.angularjs.org/1.4.3/ngRepeat/dupes?p0=record%20in%20records&p…2coachCode%22%3A%2200455532%22%2C%22%24%24hashKey%22%3A%22object%3A5%22%7D

为解决这个问题，可以在ng-repeat指令中加上track by $index，代码如下：

 <li class="item record-item" ng-repeat="record in records track by $index"></li>