angular 数据内容有重复时不显示问题
<body ng-app="app">
<div ng-controller="myctl">
<ul>
<li ng-repeat="item in arr">
{{item}}
</li>
</ul>
</div>
<script>
angular.module("app", []).controller("myctl", function ($scope, $http) {
$scope.arr = ["dd", "aa", "cc", "aa"];
});
</script>
</body>arr中有字符串"aa"重复，angular无法显示重复，想要显示可以加上：track by $index
<li ng-repeat="item in arr track by $index">