时间:2021-07-01 10:21:17 帮助过:11人阅读
定义 dom,容器中包含左拍、小球和右拍:
<p class="court">
<p class="left-paddle"></p>
<p class="ball"></p>
<p class="right-paddle"></p>
</p>居中显示:
body {
height: 100vh;
display: flex;
align-items: center;
justify-content: center;
background: linear-gradient(silver, dimgray);
}调整盒模型:
* {
box-sizing: border-box;
}画出球案:
.court {
width: 20em;
height: 20em;
color: white;
border: 1em solid currentColor;
}画出左拍:
.court {
position: relative;
}
.left-paddle
width: 1em;
height: calc(50% - 1em);
background-color: currentColor;
position: absolute;
top: 1em;
left: 1em;
}让左拍动起来:
.left-paddle {
animation: left-moving 1s linear infinite alternate;
}
@keyframes left-moving {
to {
transform: translateY(100%);
}
}类似地,画出右拍:
.right-paddle
width: 1em;
height: calc(50% - 1em);
background-color: currentColor;
position: absolute;
top: 1em;
left: 1em;
bottom: 1em;
right: 1em;
}类似地,让右拍动起来:
.right-paddle {
animation: right-moving 1s linear infinite alternate;
}
@keyframes right-moving {
to {
transform: translateY(-100%);
}
}画出小球:
.ball {
width: 100%;
height: 1em;
border-left: 1em solid currentColor;
position: absolute;
left: 2em;
top: calc(50% - 1.5em);
}让小球动起来:
.ball {
animation: bounce 1s linear infinite alternate;
}
@keyframes bounce {
to {
left: calc(100% - 3em);
}
}最后,重构一下左右拍的代码,合并共有属性:
.left-paddle,
.right-paddle {
width: 1em;
height: calc(50% - 1em);
background-color: currentColor;
position: absolute;
animation: 1s linear infinite alternate;
}
.left-paddle {
top: 1em;
left: 1em;
animation-name: left-moving;
}
.right-paddle {
bottom: 1em;
right: 1em;
animation-name: right-moving;
}大功告成!
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