AngularJs ng-repeat解決循環對象出現重複項報錯的問題

問題:ng-repeat  的循環對象是不能出現重複項的,因此若是有重複的就會報錯,應該是 key value的問題吧,不是很瞭解內部運行機制;通過查詢發現 在 循環後面加上  track by $index 就會解決問題,也就能夠有重複對象了html

報錯:bootstrap

 

劃重點數組

解決辦法:加上 track by $indexapp

       <ul>
            <li ng-repeat="x in names track by $index">
                {{x}}.{{lastname}}
                <button ng-click="delPerson($index)">刪除</button>
            </li>
        </ul>

 

完整栗子:spa

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <script src="https://cdn.staticfile.org/angular.js/1.4.6/angular.min.js"></script>
</head>

<body>

    <div ng-controller="myContrl">
        <h1>{{lastname}}家族成員:</h1>
        <ul>
            <li ng-repeat="x in names track by $index">
                {{x}}.{{lastname}}
                <button ng-click="delPerson($index)">刪除</button>
            </li>
        </ul>
        <p>添加成員:
            <input type="text" ng-model="name" placeholder="請輸入須要添加的成員名字">
        </p>
        <button ng-click="addPerson(name)">確認添加</button>
    </div>

    <script>
        angular.module('myapp', [])
            .controller('myContrl', function ($scope, $rootScope) {
                // $rootScope 根做用域,在素有的控制器中均可以用            
                $scope.name = '';
                $scope.names = ["name1", "name2", "name3", "name4", "name4"];
                $scope.sayHellow = function () {
                    $scope.greeting = "Hello," + $scope.name + "!";
                }

                $scope.delPerson = function (index) {
                    // 將點擊刪除的對象從數組中移除,angular會自動更新列表
                    $scope.names.splice(index, 1);
                }
                $scope.addPerson = function (name) {
                    // 輸入的對象添加到數組,angular會自動更新列表               
                    $scope.names.push(name);
                }

                $rootScope.lastname = "Refsnes";
            });
        //手動初始化
        angular.bootstrap(document, ['myapp']);
    </script>

</body>

</html>
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