javascript - "No ' Access-Control-Allow-Origin ' header is present on the requested resource"来自 http ://www. google.com/的响应错误

Question

//Create an Angular Module.
var newsModule = angular.module('NewsModule', []);

//Create an Angular Controller.
newsModule.controller('newsCtrl', ['$scope', '$http', function ($scope, $http) {
//function retrives POST,UPDATE,DELETE,GET data

$http.defaults.headers.put = {
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Methods': 'GET, POST, PUT, DELETE, OPTIONS',
        'Access-Control-Allow-Headers': 'Content-Type, X-Requested-With'
        };
        $http.defaults.useXDomain = true;

    $scope.throughdata = function (){

 delete $http.defaults.headers.common['X-Requested-With'];
         $http.get('http://www.google.com').then(function(data,error){
            alert(data);
            alert(error);
            $scope.days=data.data;
          });



    }
}
 ]);

但是我遇到了以下错误

XMLHttpRequest cannot load http://www.google.com/. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access.

Answer 1

Access-Control-Allow-Origin 在服务器响应上设置，不在客户端请求上设置，以允许来自不同来源的客户端访问有权访问响应。

就您而言，http://www.google.com/不允许您的来源访问响应。因此您无法阅读它。

有关 CORS 的更多信息:https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS