//路由分組
Route::group(['prefix'=>'admin','namespace'=>'Admin'],function (){

    //登錄顯示 name給路由起一個別名
    Route::get('login','LoginController@index')->name('admin.login');

    //登錄方法 name給路由起一個別名
    Route::post('login','LoginController@login')->name('admin.login');

    //定義圖形驗證碼路由
    Route::get('img_code','CommonController@imgCode')->name('admin.img_code');
});

?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use Carbon\Carbon;
use Gregwar\Captcha\CaptchaBuilder;
use Gregwar\Captcha\PhraseBuilder;

class CommonController extends Controller
{
    //驗證碼
    public function imgCode()
    {
        $phrase = new PhraseBuilder;
        // 設置驗證碼位數
        $code = $phrase->build(4);
        // 生成驗證碼圖片的Builder對象，配置相應屬性
        $builder = new CaptchaBuilder($code, $phrase);
        // 設置背景顏色25,25,112
        $builder->setBackgroundColor(34, 0, 45);
        // 設置傾斜角度
        $builder->setMaxAngle(25);
        // 設置驗證碼后面最大行數
        $builder->setMaxBehindLines(10);
        // 設置驗證碼前面最大行數
        $builder->setMaxFrontLines(10);
        // 設置驗證碼顏色
        $builder->setTextColor(230, 81, 175);
        // 可以設置圖片寬高及字體
        $builder->build($width = 150, $height = 40, $font = null);
        // 獲取驗證碼的內容
        $phrase = $builder->getPhrase();

        // 把內容存入 cache，10分鐘后過期
        $client_id = md5( rand(1,1000).time());
        \Cache::put($client_id, $phrase, Carbon::now()->addMinutes(10));

        // 組裝接口數據
        $data = [
            'client' => $client_id,
            'captcha' => $builder->inline(),
        ];
        return $data;
    }
}


![image.png](https://p9-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/8034e8b8f6ac4f0abe121f296591e3bd~tplv-k3u1fbpfcp-watermark.image)

script>
    //頁面加載完畢事件
    $(function(){
        getCaptCha();
    });

    //獲取圖形驗證碼的方法
    var getCaptCha = function (){
        $.ajax({
            url:"{{route('admin.img_code')}}",
            success(res){
                $("#client").val(res.client);
                $("#img_code").attr('src',res.captcha);
            }
        })
    }

/script>

 input type="hidden" id="client" name="client" >

div class="row cl">
                div class="formControls col-xs-8 col-xs-offset-3">
                    input name="captcha" class="input-text size-L" type="text" placeholder="驗證碼" onblur="if(this.value==''){this.value='驗證碼:'}" onclick="if(this.value=='驗證碼:'){this.value='';}" value="" style="width:150px;">
                    img id="img_code" src="" onclick="getCaptCha()"> a id="kanbuq" onclick="getCaptCha()" href="javascript:;" rel="external nofollow" >看不清，換一張/a> /div>
            /div>

 //登錄方法
    public function login(Request $request)
    {
        //接收所有參數
        $params = $request->all();
        //取出驗證碼是否一致
        $captcha = \Cache::get($params['client']);
        if ($params['captcha'] != $captcha){
            return redirect(route('admin.login'))->withErrors(['error' => '驗證碼錯誤']);
        }
    }