为背景色添加视差效果
[英]Adding parallax effect to background color
问题描述
I am working creating a parallax effect.
我正在创建视差效果。 I have an image and a background color.我有一个图像和一个背景颜色。 Based on the scroll this background color must move top and when scroll back to 0, it should move to its actual position.基于滚动，此背景颜色必须移动到顶部，当滚动回 0 时，它应该移动到其实际位置。
At the moment, when I scroll this color moves directly to top and when scroll position moves back to 0, it does not come down.目前，当我滚动此颜色时直接移动到顶部，当滚动位置移回 0 时，它不会下降。
function parallax() { var image = document.getElementById('image'); image.style.top = -(window.pageYOffset / 0.5) + 'px'; } window.addEventListener("scroll", parallax, false)
body { background: cyan; } #image { background: green; width: 100px; height: 100px; top: 310px; right: -30px; position: absolute; } .frst { color: white; position: relative; width: 100px; height: 100px; }
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1 个解决方案
解决方案1
2 已采纳 2020-03-05 09:49:21
That's because you didn't remove the top rule when it comes back to zero:那是因为当它回到零时你没有删除top规则：
if (image.style.top === "0px") {
image.style.top = "";
}
This demo will work, but that's just a "bandage".这个演示会起作用，但这只是一个“绷带”。 I would suggest using an initial top instead.我建议改用初始顶部。
function parallax() { var image = document.getElementById('image'); image.style.top = -(window.pageYOffset / 0.5) + 'px'; } window.addEventListener("scroll", parallax, false)
body { background: cyan; } #image { background: green; width: 100px; height: 100px; top: 0; right: -30px; position: absolute; transform: translateY(310px); } .frst { color: white; position: relative; width: 100px; height: 100px; }
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