我正在为wordpress构建ajax搜索插件。当我想将结果转换为json时，我没有输出。当然，我的插件可以在没有Json转换的情况下工作。

（如果我不使用Json，可以吗？？）

我的代码是：

search\\u表单。php：

add_action( \'wp_ajax_nopriv_ajax_search2\', \'ajax_search2\' );    
function ajax_search2() {
    $data = array();
    $val =$_POST[\'val\'];
    echo $val;
    if(strlen($val) > 3){
        $ppp = 6;
        $post_type = \'product\';
        $args = array(
            \'s\' => $val,
            \'post_type\' => $post_type,
            \'posts_per_page\' => $ppp
        );
        $query = new WP_Query($args);
            
        if($query->have_posts()){
            while($query->have_posts()){
                $query->the_post();
                $link=get_permalink( get_the_ID() );
                $thumb = wp_get_attachment_image_src(get_post_thumbnail_id($post->ID),\'thumbnail\'); 
                $thumb = $thumb[0];
                $data[\'product\'] .= \'<li><img src="\'.$thumb.\'"><span><a href="\'.$link.\'">\'.$query->post->post_title.\'</a></span></li>\';
        }
            
        if($query->found_posts > 6){
            $data[\'product\'] .= \'<li class="more"><a href="\'.site_url().\'/?s=\'.$val.\'&post_type=\'.$post_type.\'">ادامه</a></li>\';
            // \'the post font after 6\';
        }
         wp_reset_postdata();
    }else{
        $data[\'product\'] = "no product found2";
    }
        
    }
    $result = wp_json_encode($data);
    wp_send_json($result);// 
}

jQuery(document).ready(function ($) {
    //alert(\'this is a test for ajax\');
    $(window).click(function(){
        
        $(\'.box-search\').css(\'opacity\',\'0\');
    })
    $(\'.box-search\').click(function(event){
        event.stopPropagation();
    })
    
    var SearchReq = null;
    
    $(\'.search .search-field\').keyup(function(){
        $(\'.box-search\').css(\'opacity\',\'1\');
        var val = $(\'.search .search-field\').val();
        ajaxSearch(val);
    })
    
    function ajaxSearch(val){
        
        if( val.length < 3){
            $(\'.box-search\').css(\'opacity\',\'0\');
            return;
        }
        SearchReq = $.ajax({
            type: \'POST\',
            dataType : "json",
            url:\'http://ferfri.ir/wp-admin/admin-ajax.php\',
            data:{
                action : \'ajax_search2\',
                val : val
            },beforeSend:function(){
                $(\'.box-search ul\').html(\'قبل از ارسال\');
                if(SearchReq != null){
                    SearchReq.abort();
                }
            },success:function(res){
                res = JSON.parse(res);
                $(\'.box-search ul.product\').html(res.product);
                $(\'.box-search ul.news\').html(res);
                
            }
        })
    }
    
});