How to implement collection function and switch colors in tp5

html page, references the bootstrap icon

                            {if condition="$color == 5"}
                            <div >
                                <!-- <i id="collection" class="icon-heart cs"></i><br /> -->
                                <!-- <i id="collection" class="icon-heart" class2="cs"></i><br /> -->
                                <i id="collection" class="icon-heart cs"></i><br />
                            </div>
                            {else/}
                            <div >
                                <i id="collection" class="icon-heart"></i><br />
                            </div>
                            {/if}

css style

<style>
.like{ font-size:66px;  color:#ccc; cursor:pointer;}
.cs{color:#FF0000;}
</style>

js in

 $("#collection").click(function(){
$.ajax({
    type:'POST',
    url:"home_collection.html",
    data:{
        "art_id": {$data['id']},        // 传过去文章表的id
    },
    dataType:"json",
    success:function(data){    
        var res = JSON.parse(data);     // json 字符串转化为对象
        if (res.code == '3')            // 收藏成功，变成红色
        {    
            $('#collection').toggleClass('cs');         
            // document.getElementById('collection').style.background="#FF0000";  // 另一种样式，这是把整个背景都变红了 
            console.log(res.code);
        }
        if (res.code == '4')           // 取消收藏
        {
            $('#collection').toggleClass('cs'); 
            console.log(res.code);         
        }
    },
    error:function(data){
        console.log(data);
        console.log(data.code);
        alert(222);
    } 
});          
});

controller

// 当图标变颜色的时候，点击是取消收藏，当图片没颜色的时候点击是收藏
// 查询数据库是否存在，如果不存在则加入，存在则删除，前台也变样式
public function collection()
{
$data = $_POST;
$uname1 = session::get('USER_INFO');
$uid = $uname1['uid'];
// 应该查询当前用户对应的art_id 存不存在在 收藏表 中
$result = DB::name('collection')->where('art_id',$data['art_id'])->select();
if($result)
{
$aa = DB::name('collection')->where('art_id',$data['art_id'])->delete();
$returnData = ['code'=>4, 'info'=>'取消收藏'];
}else{
$bb['art_id'] = $data['art_id']; // 对应文章表的id
$bb['uid'] = $uid ;
$bb = DB::name('collection')->insert($bb);
$returnData = ['code'=>3, 'info'=>'收藏成功'];
}
// header('Content-Type:application/json; charset=utf-8'); 
$data3 = json_encode($returnData,JSON_UNESCAPED_UNICODE);    //这样也正确
return $data3;
// return json_encode($returnData);// 这样返回格式正确
}

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