js:根据滚动位置更改样式 [英] js: change style based in scroll position

问题描述

我有这段代码可以更改元素的背景颜色(效果很好)

I have this code to change the background color of an element (which works fine)

<script>
window.onscroll = function() {
    if(document.body.scrollTop == 0) {
       jQuery("header#main-header").css('background-color', 'red');
    }
}
</script>

问题是，仅当页面滚动在0到100之间时，我才需要将颜色设置为红色；如果大于100，则需要将颜色设置为黄色.

Problem is that I need to set the color to red only if the page scroll is between 0 and 100 and set the color to yellow if is bigger than 100.

我在此页面中尝试过此操作: http://temporal-1.d246.dinaserver.com /，但不起作用:

I tried this in this page: http://temporal-1.d246.dinaserver.com/ but not working:

<script>
window.onscroll = function() {
    if(document.body.scrollTop <= 99) {
       jQuery("header#main-header").css('background-color', 'red');
    }
    if(document.body.scrollTop >= 100) {
       jQuery("header#main-header").css('background-color', 'yellow');
    }
}
</script>

推荐答案

好吧，您需要以不同的方式计算top偏移量

Well you need to calculate top offset a little differently

window.onscroll = function() {
    var doc = document.documentElement;
    var top = (window.pageYOffset || doc.scrollTop)  - (doc.clientTop || 0);
    if(top <= 99) {
       jQuery("header#main-header").css('background-color', 'red');
    }
    else {
       jQuery("header#main-header").css('background-color', 'yellow');
    }
} 

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