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當導航欄到達我的頁面的關於部分時,我試圖讓導航欄的背景顏色從透明變爲藍色。根據來自控制檯的調用,滾動後,scroll_start
變得大於aboutOffSetTop
,但導航欄顏色不變。爲什麼會發生這種情況,我該如何解決這個問題?爲什麼導航欄在滾動後不能改變其背景顏色?
HTML:
<div id="titleSection">
<div class="nav_bar">
<ul> <li> <a href="index.html">HOME</a> </li>
<li> <a href="transportation.html">TRANSPORTATION</a> </li>
<li> <a href="crafts.html">SHOPS</a> </li>
<li> <a href="activities.html">EVENTS</a> </li>
<li> <a href="food.html">FOOD</a> </li>
</ul>
</div>
</div>
<div class="about">
<p> Text here </p>
</div>
CSS:
.nav_bar {
transition: 1s;
background-color: transparent;
}
的JavaScript:
$(document).ready(function() {
var scroll_start = 0;
var aboutOffSetTop = $('.about').offset().top;
$(document).scroll(function() {
scroll_start = $(window).scrollTop();
if(scroll_start > aboutOffSetTop) {
$('.nav').css('background-color', 'rgba(34,34,34,0.9)');
} else {
$('.nav').css('background-color', 'transparent');
}
});
});