javascript - 使用函数的 ngShow/ngHide

Question

我有一个按钮，当数组 $scope.game.players.players 包含特定值时，我想隐藏该按钮。

button(ng-click="", ng-hide="ImPlaying()") Play

函数 ImPlaying() 检查条件并返回 bool 值

$scope.ImPlaying = function(){
    $scope.game.players.playerExist($scope.user.socketID, function(exist){
        console.log(exist);
        return exist;
    });
}

存在更改值但按钮始终显示

但是当我用其代码替换函数 $scope.game.players.playerExist() 时，一切都会按预期工作。

$scope.ImPlaying = function(){
    for (var i = 0; i < $scope.game.players.players.length; i++) {
        if($scope.game.players.players[i]){
            if($scope.game.players.players[i].socketID == $scope.user.socketID){
                return true;
            }
        }
    };
    return false;
}

第一个函数有什么问题？

Answer 1

ImPlaying 函数中缺少 return 语句

$scope.ImPlaying = function(){
    return $scope.game.players.playerExist($scope.user.socketID, function(exist){
        console.log(exist);
        return exist;
    });
}