我希望蓝色方块可见,而红色方块隐藏在蓝色方块下方。蓝色和红色不应重叠,它们需要一个接一个地排列。但是我的 CSS 没有这样做。我错过了什么?
document.getElementById('startAnim').addEventListener('click', function() {
document.getElementById('red').classList.add('animate');
});
#background {
position: relative;
background-color: #3CF;
width: 50px;
height: 50px;
overflow-y: hidden;
border: medium;
}
#blue {
background-color: blue;
width: 50px;
height: 50px;
border: thin;
top: 0%;
border-color: #000;
border-width: 1px;
}
#red {
background-color: red;
width: 50px;
height: 50px;
top: 50%;
border: thin;
border-color: #000;
border-width: 1px;
}
.sq {
position: absolute;
}
.animate {
-webkit-animation-name: slidediv;
/* Chrome, Safari, Opera */
-webkit-animation-duration: 4s;
/* Chrome, Safari, Opera */
-webkit-animation-timing-function: ease-in-out;
}
/* Standard syntax */
@keyframes slidediv {
0% {
top: 10px;
}
100% {
top: 100px;
}
}
<div id="background">
<div id="blue" class='sq'></div>
<div id="red" class='sq'></div>
</div>
<button id="startAnim"> Start </button>
答案 0 :(得分:1)
我的理解是你需要将红色方块隐藏在蓝色方块下面,这样你就可以使用 z-index 来解决这个问题,如果这就是你要找的,试试我的代码片段
document.getElementById('startAnim').addEventListener('click', function() {
document.getElementById('blue').classList.add('animate');
});
#background {
position: relative;
background-color: #3CF;
width: 50px;
height: 50px;
overflow-y: hidden;
border: medium;
}
#blue {
background-color: blue;
width: 50px;
height: 50px;
border: thin;
top: 0%;
border-color: #000;
border-width: 1px;
z-index:7;
}
#red {
background-color: red;
width: 50px;
height: 50px;
top: 0%;
border: thin;
border-color: #000;
border-width: 1px;
z-index:6;
}
.sq {
position: absolute;
}
.animate {
-webkit-animation-name: slidediv;
/* Chrome, Safari, Opera */
-webkit-animation-duration: 4s;
/* Chrome, Safari, Opera */
-webkit-animation-timing-function: ease-in-out;
}
/* Standard syntax */
@keyframes slidediv {
0% {
top: 0px;
}
100% {
top: 100px;
}
}
<div id="background">
<div id="blue" class='sq'></div>
<div id="red" class='sq'></div>
</div>
<button id="startAnim"> Start </button>
答案 1 :(得分:0)
我将 #red top 属性更新为 100%。如下图:
#red {
background-color: red;
width: 50px;
height: 50px;
top: 100%;
border: thin;
border-color: #000;
border-width: 1px;
}