Selector friends can try this idea to delay the execution of the merge selection operation_javascript skills

This looks like the four selection operations in the same code snippet below
$class("a").color("green");
$class("b").color("red" );
$class("c").color("green");
$class("d").color("red");
In the end, only one traversal is needed. .
Because I didn’t pay too much attention to the selector problem before. I wonder if I am out. Everyone has already thought of it?
The following is a sample, two selections and one traversal

<div class="a">aaaaaaaaaaaaaa</div> <div class="a b">bbbbbbbbbbbb</div> <div class="b">cccccccccccccccc</div>
[Ctrl A select all Note: If you need to introduce external Js, you need to refresh to execute

]<script> var $class = function () { var checker = []; var updateHandler = null; var traverse = function (node,func){ func(node); for(var i = 0; i<node.childNodes.length; i++) { func(node.childNodes[i]) } } function update () { traverse(document.body,function(node){ for(var i = 0 ; i< checker.length; i++) checker[i](node); }); checker = []; updateHandler = null; } function startupdate() { if(updateHandler!==null) return ; updateHandler = setTimeout(update,10); } var $class = function(jpath){ var color; checker.push(function(node){ if(typeof node.className != "string")return; var classes = node.className.split(" ") for(var i = 0; i < classes.length ; i++) if(classes[i] == jpath && color) { node.style.backgroundColor = color; break; } }); return { color:function(v){ color = v; startupdate(); } } } $class.update = update; return $class; }(); $class("a").color("green"); $class("b").color("red"); </script>