Javascript 为背景色添加视差效果_Javascript_Jquery

Javascript 为背景色添加视差效果

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Javascript 为背景色添加视差效果,javascript,jquery,Javascript,Jquery,我正在创造一个视差效果。我有图像和背景色。根据滚动，此背景色必须移到顶部，当滚动回0时，它应移到其实际位置此时，当我滚动此颜色直接移到顶部，当滚动位置移回0时，它不会下降函数视差（）{ var image=document.getElementById（'image'）； image.style.top=-（window.pageYOffset/0.5）+“px”； } window.addEventListener（“滚动”，视差，假）正文{ 背景：青色； } #形象{ 背景：绿色；

我正在创造一个视差效果。我有图像和背景色。根据滚动，此背景色必须移到顶部，当滚动回0时，它应移到其实际位置

此时，当我滚动此颜色直接移到顶部，当滚动位置移回0时，它不会下降

函数视差（）{
var image=document.getElementById（'image'）；
image.style.top=-（window.pageYOffset/0.5）+“px”；
}
window.addEventListener（“滚动”，视差，假）

正文{
背景：青色；
}
#形象{
背景：绿色；
宽度：100px；
高度：100px；
顶部：310px；
右：-30px；
位置：绝对位置；
}
.第一{
颜色：白色；
位置：相对位置；
宽度：100px；
高度：100px；
}

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这是因为当

top

规则归零时，您没有删除它：

if (image.style.top === "0px") {
  image.style.top = "";
}

这个演示会起作用，但那只是一个“绷带”。我建议改为使用初始顶部

函数视差（）{
var image=document.getElementById（'image'）；
image.style.top=-（window.pageYOffset/0.5）+“px”；
}
window.addEventListener（“滚动”，视差，假）

正文{
背景：青色；
}
#形象{
背景：绿色；
宽度：100px；
高度：100px；
排名：0；
右：-30px；
位置：绝对位置；
变换：translateY（310px）；
}
.第一{
颜色：白色；
位置：相对位置；
宽度：100px；
高度：100px；
}