我想在jquery中将“document”更改为“id”

Question

我想在这个脚本的 jquery 中将 document 更改为 id

$(document).on("scroll",function(){       
   if($(document).scrollTop()>100){
      $("#brand1h1").removeClass("screen_block_title").addClass("screen_block_title2");
   } else {
      $("#brand1h1").removeClass("screen_block_title2").addClass("screen_block_title");
   }
});

我不想在页面滚动上更改，我想在页面中间指定特定的 id

Answer 1

我认为您正在寻找类似的东西，如果没有，请告诉我。

$("#d").on("scroll",function(){       
   if(1==1){  //CHANGE IF CONDITION AS NEEDED
      alert("Scrolled");
   } else {
       //ELSE CODE HERE 
   }
});

#d
{
    height:40px;
    overflow-y:scroll;
    
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<DIV id="d">
    Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
    </div>