javascript - json 不显示 dataType :'json'

Question

我正在做一个 ajax get 调用我可以成功 console.log 结果，而无需将数据类型 json 放入 ajax

    dataType: 'json',

当我 console.log 没有它时，我得到

{"id":"1","post_id":"748037498494861","post_title":"laptop","image1":"team217.jpg","price":"1234"}{"id":"2","post_id":"740811329642473","post_title":"remote control car","image1":"team522.jpg","price":"50"}{"id":"4","post_id":"316194613858174","post_title":"Ipad 3","image1":"team523.jpg","price":"400"}

但是我无法显示json数据如果我放

     dataType: 'json',

我的

      console.log

为空我不明白问题出在哪里

    $(document).ready(function(){
var username = $("#usernameinfo").text();

$.ajax({
    type:"GET",


    url: "<?= base_url()?>"+"account/listings/more_user_ads",
    data: {"username":username,"pid":"<?=$this->input->get('pid')?>"},
    success: function(res){
      console.log(res);   

}


});

});

php

 function more_user_ads(){
$post_id = $this->input->get('pid');

$username = $this->input->get('username');
$query = $this->get_where_custom('username', $username);
if($query->num_rows()>0){
    foreach($query->result() as $row){
        if($post_id != $row->post_id){
       $result = array(
           'id'=> $row->id,
           'post_id'=> $row->post_id,
           'post_title'=> $row->post_title,
           'image1'=> $row->image1,
           'price'=> $row->price,
           'price'=> $row->price,

       );

       $res = json_encode($result);

        echo $res;

Answer 1

将每一行添加到 $result 数组中，然后 echo json_encode 一次。

public function more_user_ads()
{
    $post_id  = $this->input->get('pid');
    $username = $this->input->get('username');
    $query    = $this->get_where_custom('username', $username);

    $result = []; //so we have something if there are no rows
    if($query->num_rows() > 0)
    {
        foreach($query->result() as $row)
        {
            if($post_id != $row->post_id)
            {
                $result[] = array(
                    'id'         => $row->id,
                    'post_id'    => $row->post_id,
                    'post_title' => $row->post_title,
                    'image1'     => $row->image1,
                    'price'      => $row->price,
                    'price'      => $row->price,
                );
            }
        }
    }
    echo json_encode($result);
}

实际上，您可以使用 $query->result_array(); 来缩短这个时间，因为您不必将对象转换为数组。

public function more_user_ads()
{
    $post_id  = $this->input->get('pid');
    $username = $this->input->get('username');
    $query    = $this->get_where_custom('username', $username);

    $result = []; //so we have something if there are no rows
    if($query->num_rows() > 0)
    {
        $rows = $query->result_array();
        foreach($rows as $row)
        {
            if($post_id != $row['post_id'])
            {
                $result[] = $row;
            }
        }
    }
    echo json_encode($result);
}