javascript - Element visible betwen scroll points -

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i have element visible when scroll bigger 890px. have problem element has visible between 890px , 920px, , if user scroll more thna 920 or less 890px need hide element.

i using animated css adding animation element when appear.

this have in js

var $document = $(document),     $elementfield = $('.center-field');  $document.scroll(function () {     if ($document.scrolltop() >= 890) {         $elementfield.stop().addclass("show animated bounceindown");       } });

now appear when user scroll more 890px, when user goes stay again, there somekind of watch user scroll?

just bit more specific if condition.

var $document = $(document),      $elementfield = $('.center-field');    $document.scroll(function () {    if ($document.scrolltop() >= 890 && $document.scrolltop() <= 920) {      $elementfield.css('color', 'tomato');      } else {      $elementfield.css('color', 'blue');     }  });
body {    position: relative;    height:1800px;  }    .center-field {    position: absolute;    top: 900px;    color: blue;  }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>  <p>scroll down please</p>  <h1 class="center-field">hello</h1>


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