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1¡¢siteController¿ØÖÆÆ÷µÄactions½¨Ôo¼ÓcaptchaÉeÖÃ

    public function actions() { 
    return [ 
    'captcha' => [ 
    'class' => 'yii\captcha\CaptchaAction', 
    'maxLength' => 4, 
    'minLength' => 4 
    ], 
    ]; 
    }

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    public function behaviors() { 
    return [ 
    'access' => [ 
    'class' => AccessControl::className(), 
    'rules' => [ 
    [ 
    'actions' => ['login', 'error', 'captcha'], 
    'allow' => true, 
    ], 
    ], 
    ]; 
    }

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3¡¢ÎÒÃÇ¿´¿´view²a£¬Ôo¼ÓÑeÖ¤Âeinput¡£

    use yii\captcha\Captcha; 
    <?= $form->field($model, 'verifyCode')->widget(Captcha::className(), [ 
    'template' => '<div class="row"><div class="col-lg-3">{image}</div><div class="col-lg-6">{input}</div></div>', 
    ]) ?> 

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    class LoginForm extends Model { 
    //...... public $verifyCode; 
    public function rules() { 
    return [ 
    //...... 
    ['verifyCode', 'captcha'], 
    ]; 
    } 
    public function attributeLabels() { 
    return [
    'verifyCode' => '', //ÑeÖ¤ÂeµÄÃu³Æ£¬¸u¾Ý¸oÈËϲºÃÉe¶¨ 
    ]; 
    } 
    } 
    //¶¨ÒaÁËverifyCodeÊoÐÔ 
    //rules¹aeÔoÌi¼ÓÁËÑeÖ¤ 
    //labelÖж¨ÒaÁËÆaÏÔʾÃu³Æ 

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    $('ÑeÖ¤Âe¶ÔÏo').click();

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