Javascript moves the mouse up and the small triangle slider slowly follows the effect_javascript skills

function changeCoord(id, left ) {
$$(id).style.left = left;
}
function $$(id) {
return document.getElementById(id);
}
function $$$(id) {
return document.getElementsByClassName(id)[0];
}
function indexOf(arry, obj) {
for (var i = 0; i < arry .length; i ) {
if (obj == arry[i]) {
return i;
}
};
}
window.onload = function() {
//Register events for all sliders on the page
//products-box-center parent container object

var obj = document.getElementsByClassName('products-box-center');
for(var i=0;itry{
var base=obj[i].getElementsByClassName('products-box-center-title')[0]; //Get the title of each item
var elems=base.getElementsByClassName('products-items-title');
for(var j=0;jvar elem =elems[j];
elem.onmousemove=function(){
//Get the parent container of the current object’s parent container
var baseElem=this.parentElement.parentElement;
var baseIndex=indexOf (obj,baseElem) 1;

//Get the coordinates of the current object
var left = this.offsetLeft;

//Get the corresponding slider object
var slider= $$('products-triangle-' baseIndex);

//Change the coordinates of the slider
slider.style.left = left "px";
//Change the current object and other objects Color
this.style.color = "red";
//Get all elements under the current parent container
var notes=this.parentElement.getElementsByClassName('products-items-title');
for(var k=0;kif(this!=notes[k])
notes[k].style.color="#666";
}

};
}

}
catch(e){
alert(e);
}
};
}