Question

首次应用程序加载时我想计算一个值并将其分配给$scope.about

app.controller('myCtrl', function ($scope,$http,$location,$route) {
    $scope.var1 = 'some value'; /*this works*/

    $scope.about = $scope.getAbout(); //ERROR IS ON THIS LINE
    /*above line throws error saying $scope.getAbout is not a function*/   
    $scope.getAbout = function(){
        var a = /* get it from webservice via $http */
        a = process a;
        return a;
    }

    $scope.otherFunction = function(){
        //if I call $scope.getAbout here from inside another function it works fine.
        $scope.about = $scope.getAbout(); 
    } 
});

Answer 1

在定义之前使用$scope.getAbout。首先定义函数，然后使用它。

$scope.about = $scope.getAbout(); // This WILL throw an error

// Define the function
$scope.getAbout = function(){
    var a = /* get it from webservice via $http */
    a = process a;
    return a;
}

$scope.about = $scope.getAbout(); // This WON'T throw an error

Answer 2

而不是返回函数$ scope.getAbout只是使用它。希望它会奏效。

 $scope.getAbout = function(){
         var a = /* get it from webservice via $http */
         a = process a;
        $scope.about  = a;
         return false; 
   }

无需使用$ scope.about = $ scope.getAbout（）;

angularjs将范围函数赋给范围变量，表示函数不是函数

2 个答案: