http://stackoverflow.com/questions/14974271/can-you-change-a-path-without-reloading-the-controller-in-angularjs
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$location.search({vln: $scope.vln_id}, false);
會改變url中 ? 后面的 搜索參數,但是controller不會重新實例化。
angular 官方文檔:https://docs.angularjs.org/guide/$location
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