加载脚本的功能

(source)

function loadScript(url,callback)
{
    // Adding the script tag to the head as suggested before
    var head = document.getElementsByTagName('head')[0];
    var script = document.createElement('script');
    script.type = 'text/javascript';
    script.src = url;
 
    // Then bind the event to the callback function.
    // There are several events for cross browser compatibility.
    script.onreadystatechange = callback;
    script.onload = callback;
 
    // Fire the loading
    head.appendChild(script);
 
   //modification so we can remove this after
   return script;
}

注意：这是一个常规的JS函数

动态加载脚本

在你的Angular控制器中

$scope.loadGoogleRecaptcha = function (id,lang) {
            /// using timeout not to use $apply
            $timeout(function () {
                //set default value
                var elemntID = id || false;
                var language = lang || 'en';
 
                if (!elemntID) {
                    console.warn('NO Id selected for re-captcha loading!')
                    return false;
                }
 
                var element = document.getElementById(elemntID)
                if (angular.element(element).length == 0) {
                    console.warn('provided id doesn\'t exist ',elemntID);
                    return false;
                }
 
                //Delete oldscript
                if ($rootScope.addedScript)
                    angular.element($rootScope.addedScript).remove();
 
                //clear current recaptcha container
                angular.element(element).empty();
 
                var url = "https://www.google.com/recaptcha/api.js?onload=onloadCallback&render=explicit&hl=" + lang;
 
                return $window.loadScript(url,function () {
                    console.log('Scipt loaded:',url);
                })
 
            });
 
        }

使用angular-translate-localStorage使用当前语言初始化验证码

$rootScope.addedScript = $scope.loadGoogleRecaptcha('g-recaptcha-register',$window.localStorage.getItem( 'NG_TRANSLATE_LANG_KEY'));

切换语言的功能样本

$rootScope.changeLanguage = function (langKey) {
 
        $translate.use(langKey);
        $rootScope.selectedLanguage = langKey;
        $scope.loadGoogleRecaptcha('g-recaptcha-register',langKey);
    };

或者你可以使用观察者

$scope.$watch(
            'selectedLanguage',function (n,o) {
              //putting if to prevent double fetch the first time
              if (!!n && n != o){
                $rootScope.addedScript = $scope.loadGoogleRecaptcha('g-recaptcha-register',n);
              }
            }
        );