Image赢得't隐藏在滚动jQuery上

Image won't hide on scroll jQuery

本文关键字：滚动 jQuery 隐藏 赢得 Image      更新时间：2023-09-26

你好，我正在做一个项目，我在codepen.io上找到了一个免费的fiddle。在网站上，它运行得很好，当你转到我为它制作的js fiddle时，会出现问题。当您向下滚动到主要内容时，主要标题和框会显示在文本上方。有没有办法像原始代码笔上显示的那样消除这种情况？

Fiddle HERE

function EasyPeasyParallax() {
	scrollPos = $(this).scrollTop();
	$('#banner').css({
		'background-position' : '50% ' + (-scrollPos/4)+"px"
	});
	$('#bannertext').css({
		'margin-top': (scrollPos/4)+"px",
		'opacity': 1-(scrollPos/250)
	});
}
$(document).ready(function(){
	$(window).scroll(function() {
		EasyPeasyParallax();
	});
});

编织：http://kodeweave.sourceforge.net/editor/#dcbf9c586b0e798fce89be31c50e3950

注意：zIndex仅适用于已定位的元素。

我所做的只是告诉#content是position relative，它运行良好。

html, body {
  height: 100%;
}
body {
  background: #FFF;
  font: 400 1.5em/1.5 "Droid Serif", serif;
  color: #111;
  text-align: center;
}
h1 {
  font: 700 2.8em/1.2 "Droid Sans", sans-serif;
}
h2 {
  font: 700 1.5em/1.5 "Droid Sans", sans-serif;
  margin: 1em 0;
}
#banner {
  background: url(http://f.cl.ly/items/1b2V08451N440W0H420K/bg.jpg) no-repeat fixed 50% 0;
  background-size: cover;
  color: #fff;
  height: 100%;
  margin-left: -7px;
  margin-top: -8px;
  width: 100%;
  z-index: 1;
}
#bannertext {
  width: 24em;
  position: fixed;
  top: 20%;
  left: 50%;
  border: .5em solid #fff;
  margin-left: -12em;
  padding: 2em 0;
    z-index: 1;
}
#content {
  position: relative;
  max-width: 28em;
  text-align: justify;
  margin: 0 auto;
  padding: 2em;
    z-index: 10;
}
#content p {
  margin: 0 0 2em;
  z-index: 10;
}
<div id="banner">
  <div id="bannertext">
    <h1>| EX |</h1>
    <p>Get famous on twitter.</p>
  </div>
</div>
<div id="content">
  <h2>EX</h2>
  <br>
  <br>
  <br>
  <h2>EX.</h2>
  <p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Proin pellentesque, est ut venenatis aliquam, lorem quam porttitor ligula, eget ultrices velit dui sed quam. Praesent vehicula placerat lectus. Nulla pede. Quisque a nulla quis massa pulvinar sagittis. Pellentesque neque massa, mattis vulputate, pellentesque nec, vehicula volutpat, purus. Proin pretium dui et nulla cursus eleifend. Aenean aliquam urna eget urna. Vestibulum euismod elit. Donec eget augue sit amet neque elementum pretium. Proin posuere lacus id lacus. Duis vel justo suscipit neque ornare iaculis.</p>
  <p>Ut urna urna, rhoncus eget, vestibulum tempus, venenatis non, nunc. Nunc consequat quam in nulla. Praesent feugiat posuere orci. Sed ac ante. Mauris pellentesque massa vitae ante mattis bibendum. Quisque dapibus lectus eu eros. Nulla facilisi. Praesent hendrerit egestas erat. Suspendisse at velit. Quisque mollis feugiat est. Curabitur ut leo. Cras auctor semper augue. Pellentesque leo pede, tempus sed, ornare in, venenatis sed, nisl. Quisque est velit, eleifend vitae, mollis ac, adipiscing at, eros. Mauris velit. Etiam nec lorem. Vestibulum pellentesque ligula a velit. Maecenas felis metus, suscipit et, eleifend vel, accumsan vitae, magna. Phasellus ut justo vel magna congue laoreet.</p>
</div>

添加

  background: #fff;
  position: relative;

到#content元素。

示例：https://jsfiddle.net/gu7dt5oz/1/

如果我没有记错，z-index只适用于定位的元素。

我在#content、#content p和#banner中添加了"position:relative；"，这似乎很有效。

html {
  height: 100%;
}
body {
  background: #FFF;
  font: 400 1.5em/1.5 "Droid Serif", serif;
  color: #111;
  text-align: center;
  height: 100%;
}
h1 {
  font: 700 2.8em/1.2 "Droid Sans", sans-serif;
}
h2 {
  font: 700 1.5em/1.5 "Droid Sans", sans-serif;
  margin: 1em 0;
}
#banner {
  background: url(http://f.cl.ly/items/1b2V08451N440W0H420K/bg.jpg) no-repeat fixed 50% 0;
  background-size: cover;
  color: #fff;
  height: 100%;
  margin-left: -7px;
  margin-top: -8px;
  width: 100%;
  z-index: 1;
  position:relative;
}
#bannertext {
  width: 24em;
  position: fixed;
  top: 20%;
  left: 50%;
  border: .5em solid #fff;
  margin-left: -12em;
  padding: 2em 0;
    z-index: 1;
}
#content {
  max-width: 28em;
  text-align: justify;
  margin: 0 auto;
  padding: 2em;
    z-index: 10;
    position:relative;
}
#content p {
  margin: 0 0 2em;
  z-index: 10;
  position:relative;
}

只需使用最新版本的jQuery，它就可以很好地进行

Fiddle：https://jsfiddle.net/gu7dt5oz/2/

<script src="https://code.jquery.com/jquery-2.2.3.min.js"
integrity="sha256-a23g1Nt4dtEYOj7bR+vTu7+T8VP13humZFBJNIYoEJo="
crossorigin="anonymous"></script>
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