for(let i=0;i<titles.length;i++){

// titles[i].id = i;

var time = null;

titles[i].onmouseover = function(){

const self = this;

if(time){

clearTimeout(time);

}

time = setTimeout(function(){

for(let j=0;j<titles.length;j++){

titles[j].className = '';

divs[j].style.display = "none";

}

self.className = 'select';

divs[i].style.display = "block";

},300);

}

}