Commonly used left navigation effects, JS is simple, and is designed to improve navigation performance. You can refer to the application.
Effect display:
HTML:
JS:
$(".menu_list li").mouseenter(function(){
$(".menu_box").show();
var nav_index = $(".menu_list li") .index(this);
$(".menu_cont").eq(nav_index).show()//The sliding menu corresponds to the current content
.siblings().hide();
});
$(".menu").mouseleave(function(){
$(".menu_box").hide();
}) ;