jQuery realizes the mouse wheel to dynamically change the style or effect_jquery

The code is as follows:

Copy code The code is as follows:

$(window).scroll(function() {
              var scrolls = $(this).scrollTop();
                $(".context_block").each(function(){ //Block-level element with class name "context_block"
              var height = $(this).height();
If($(this).position().top height-60> scrolls){
                                                                                                                                           var _index = $(".context_block").index($(this));
                                                                                                                                                                                                                                                                                through $($(".menu a")[_index]).addClass("hover_mobileLink");//Dynamically change the style of the a tag under the block-level element with class "menu" (add or delete a class)
                         return false;
                }
            });
        });

The core code is very simple, but the implementation effect is very good. I recommend it to my friends here.