传递$范围变量的函数在AngularJS [英] passing $scope variable to a function in AngularJS

问题描述

我一直在试图建立在角通用函数改变一个 $范围参数值。

I've been trying to create a generic function in angular that changes a $scope parameters value.

我一直在想，为什么我不能通过 $ scope.var 为参数到函数例如：

I've been wondering why I cannot pass $scope.var as an argument to a function e.g.:

webApp.controller ('VotesCtrl', function ($scope) {
    $scope.param = 42;

    change($scope.param);
    function change(contextParam) {
      contextParam = (Math.random()*100)+1;
    };
});

当我跑了这个功能 $ scope.param 42仍然

When I ran this function $scope.param remains 42.

是否有其他外：

webApp.controller ('VotesCtrl', function ($scope) {
    $scope.param = 42;

    change('param');
    function change(contextParam) {
      $scope[contextParam] = (Math.random()*100)+1;
    };
});

我普拉克

推荐答案

简短的回答是不绑定到原始值。见<一href=\"http://stsc3000.github.io/blog/2013/10/26/a-tale-of-frankenstein-and-binding-to-service-values-in-angular-dot-js/\">http://stsc3000.github.io/blog/2013/10/26/a-tale-of-frankenstein-and-binding-to-service-values-in-angular-dot-js/

The short answer is "Don't bind to primitive values". See http://stsc3000.github.io/blog/2013/10/26/a-tale-of-frankenstein-and-binding-to-service-values-in-angular-dot-js/

var webApp = angular.module('webApp', []);

//controllers
webApp.controller ('VotesCtrl', function ($scope) {
    $scope.param = { value: 42 };

    change($scope.param);
    function change(contextParam) {
      contextParam.value = (Math.random()*100)+1;
    };
});

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