Question

到目前为止我用w3.css构建了这个：

 $(function() {

  $(window).scroll(function() {
    var x = $(window).scrollTop();
    var h = $("#navi").height();
    var z = $("#topper").height();

    if (x >= z) {
      //$("#header").hide();
      $("#navi").addClass("w3-top");
      $("#content").css("margin-top", h);
    } else {
      //$("#header").show();
      $("#navi").removeClass("w3-top");
      $("#content").css("margin-top", 0);
    }

  });

});

<head>
	<title></title>
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
	<link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
</head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>


<body>

	<header class="w3-container" id="topper">
		<span>HEADER HEADER HEADER</span>
	</header>
  
	<div class="" id="navi">
		<div class="w3-bar w3-pink">
			<span class="w3-bar-item" style="display: none; width:">SOLI</span>
			<div class="w3-dropdown-hover">
				<button class="w3-button w3-mobile">1</button>
				<div class="w3-dropdown-content w3-bar-block w3-card-4">
					<a href="#" class="w3-bar-item w3-button" style="width:">1a</a>
					<a href="#" class="w3-bar-item w3-button" style="width:">1b</a>
					<a href="#" class="w3-bar-item w3-button" style="width:">1c</a>
					<a href="#" class="w3-bar-item w3-button" style="width:">1d</a>
				</div>
			</div>
			<div class="w3-dropdown-hover" id="navi">
				<button class="w3-button">2</button>
				<div class="w3-dropdown-content w3-bar-block w3-card-4">
					<a href="#" class="w3-bar-item w3-button" style="width:">2a</a>
					<a href="#" class="w3-bar-item w3-button" style="width:">2b</a>
					<a href="#" class="w3-bar-item w3-button" style="width:">2c</a>
					<a href="#" class="w3-bar-item w3-button" style="width:">2d</a>
					<a href="#" class="w3-bar-item w3-button" style="width:">2e</a>
					<a href="#" class="w3-bar-item w3-button" style="width:">2f</a>
				</div>
			</div>
			<a href="#" class="w3-bar-item w3-button" style="width:">3</a>
			<a href="#" class="w3-bar-item w3-button" style="width:">4</a>
			<a href="#" class="w3-bar-item w3-button" style="width:">5</a>
			<a href="#" class="w3-bar-item w3-button w3-right" style="width:">6</a>
		</div>
	</div>

	<div class="" id="content">
		<img src="https://assets.pixolum.com/blog/wp-content/uploads/2016/10/focus-stacking-scharfe-bilder-1.jpg">
		<img src="https://assets.pixolum.com/blog/wp-content/uploads/2016/10/focus-stacking-scharfe-bilder-1.jpg">
		<img src="https://assets.pixolum.com/blog/wp-content/uploads/2016/10/focus-stacking-scharfe-bilder-1.jpg">
	</div>
</body>

但问题是每当我向下滚动内容（鹰图片）时，也会隐藏在导航栏后面...... 当我瘫痪时，我希望网站的行为类似于this page。

有谁知道该怎么办？：）

抱歉： DDDDDDD dddddddddddddddddd dddddddddddddddd ddddddddddddddddddddddddddd DDDDDD

Answer 1

很难说出你想要的东西，但我认为就是这样。您需要通过CSS添加背景并在其上使用fixed属性。

$(function() {

  $(window).scroll(function() {
    var x = $(window).scrollTop();
    var h = $("#navi").height();
    var z = $("#topper").height();

    if (x >= z) {
      //$("#header").hide();
      $("#navi").addClass("w3-top");
      $("#content").css("margin-top", h);
    } else {
      //$("#header").show();
      $("#navi").removeClass("w3-top");
      $("#content").css("margin-top", 0);
    }

  });

});

<head>
	<title></title>
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
	<link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
</head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>


<body style='background: url(https://assets.pixolum.com/blog/wp-content/uploads/2016/10/focus-stacking-scharfe-bilder-1.jpg) no-repeat center center fixed; background-size: cover; height: 200em;'>

	<header class="w3-container" id="topper">
		<span>HEADER HEADER HEADER</span>
	</header>
  
	<div class="" id="navi">
		<div class="w3-bar w3-pink">
			<span class="w3-bar-item" style="display: none; width:">SOLI</span>
			<div class="w3-dropdown-hover">
				<button class="w3-button w3-mobile">1</button>
				<div class="w3-dropdown-content w3-bar-block w3-card-4">
					<a href="#" class="w3-bar-item w3-button" style="width:">1a</a>
					<a href="#" class="w3-bar-item w3-button" style="width:">1b</a>
					<a href="#" class="w3-bar-item w3-button" style="width:">1c</a>
					<a href="#" class="w3-bar-item w3-button" style="width:">1d</a>
				</div>
			</div>
			<div class="w3-dropdown-hover" id="navi">
				<button class="w3-button">2</button>
				<div class="w3-dropdown-content w3-bar-block w3-card-4">
					<a href="#" class="w3-bar-item w3-button" style="width:">2a</a>
					<a href="#" class="w3-bar-item w3-button" style="width:">2b</a>
					<a href="#" class="w3-bar-item w3-button" style="width:">2c</a>
					<a href="#" class="w3-bar-item w3-button" style="width:">2d</a>
					<a href="#" class="w3-bar-item w3-button" style="width:">2e</a>
					<a href="#" class="w3-bar-item w3-button" style="width:">2f</a>
				</div>
			</div>
			<a href="#" class="w3-bar-item w3-button" style="width:">3</a>
			<a href="#" class="w3-bar-item w3-button" style="width:">4</a>
			<a href="#" class="w3-bar-item w3-button" style="width:">5</a>
			<a href="#" class="w3-bar-item w3-button w3-right" style="width:">6</a>
		</div>
	</div>


</body>

如何在不移动内容的情况下删除导航栏上方的元素？

1 个答案: