angularJs ng-repeat 去重复

自定义过滤去除angularJs ng-repeat：

app.filter('unique', function() {
   return function(collection, keyname) {
      var output = [], 
          keys = [];

      angular.forEach(collection, function(item) {
          var key = item[keyname];
          if(keys.indexOf(key) === -1) {
              keys.push(key);
              output.push(item);
          }
      });

      return output;
   };
});

<div ng-repeat="item in items | unique: 'id'"></div>