js 两个滚动事件相互影响

  document.addEventListener('scroll', function(event) {
            if (event.target.id === 't_r_content') { // or any other filtering condition     
                var c = document.getElementById(event.target.id).scrollTop;
                document.getElementById("cl_freeze").scrollTop = c;
                console.log(c);
            }  else if (event.target.id === 'cl_freeze') { // or any other filtering condition      
                var a = document.getElementById(event.target.id).scrollTop;
                document.getElementById("t_r_content").scrollTop = a;
                console.log(a);
            } 
        }, true  ); 

滚动的时候会相互影响，记录下问题，还没有解决