一、建立中间件

php artisan make:middleware CorsAjax

二、编写中间件 CorsAjax

<?php

namespace App\Http\Middleware;

use Closure;

class CorsAjax
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        header('Access-Control-Allow-Origin: *');
        header("Access-Control-Allow-Credentials: true");
        header("Access-Control-Allow-Methods: *");
        header("Access-Control-Allow-Headers: Content-Type,Access-Token");
        header("Access-Control-Expose-Headers: *");

        return $next($request);
    }
}

三、注册中间件 Kernel.php

protected $routeMiddleware = [
    'authorize' => \App\Http\Middleware\authorize_middleware::class,
    'common' => \App\Http\Middleware\common::class,
    'cors' => \App\Http\Middleware\CorsAjax::class,
];

四、在路由中应用中间件

/**
 * API 调用
 */
Route::group([
    'middleware' => ['cors'],
    'prefix' => 'api',
], function () {
    Route::any('/', function () {
        $result = [
            'App' => '回家吃饭',
            'Version' => '1.0.1'
        ];
        return $result;
    });

    Route::any('/cab/getpagelist', function () {
        $cab = new \App\cab();
        $params = $_GET;
        $result = $cab->getpagelist($params);
        return response($result, 200);
    });
});

五、运行后端 Laravel http服务

假设域名为 foo.com

六、运行前端 http 服务

npm run dev

七、可以在组件中 （.vue）使用 AJAX 跨域访问了

代码如下：

getDataRemote: function () {
  let self = this;
  let url = 'http://foo.com/api/cab/getpagelist';
  let params = {
    field: self.field,
    keyword: self.keyword
  };
  this.$axios
    .get(url, {
      params: params
    })
    .then(function (response) {
      let data = response.data;
      if (data.total > 0) {
        self.page += 1;
        self.cabData.rows = _.union(self.cabData.rows, response.data.rows);
      }
    });
},