效果
先看效果,当鼠标点击相应的图片，图片会做出相应的变换，1，图片变宽，2，上下文字变出来，中间字体变大。再次点上下文字会消失，图片会变窄。我在此基础上将点击事件改为监听鼠标移动事件，当鼠标在相应对象上时，会做出相同的变换，反之移除也一样。
image.png
image.png
重点
transitionend结束会有两个事件出来，一个是font-size， 一个是flex，当一个事件结束时会做toggle切换，如果没有变成有，如果有变成没有，如果不做判断相当于两次抵消，样式没有发生变化，单数时会变换，双数时不会变换。
const panels = document.querySelectorAll('.panel');
function clickHandler() {
this.classList.toggle('open');
}
function transitionHandler(e) {
if (e.propertyName.includes('flex')) {
this.classList.toggle('open-active');
}
}
panels.forEach((panel) =>{
panel.addEventListener("click", clickHandler);
panel.addEventListener("transitionend",transitionHandler)
})
完整代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Flex 💪</title>
<link href='https://fonts.googleapis.com/css?family=Amatic+SC' rel='stylesheet' type='text/css'>
</head>
<body>
<style>
html {
box-sizing: border-box;
background: #ffc600;
font-family: 'helvetica neue';
font-size: 20px;
font-weight: 200;
}
body {
margin: 0;
}
.panels {
min-height: 100vh;
overflow: hidden;
display: flex;
}
.panel {
flex: 1;
box-shadow: inset 0 0 0 5px rgba(255,255,255,0.2);
text-align: center;
align-items: center;
color: white;
font-size: 20px;
background-size: cover;
background-position: center;
transition:
font-size 0.7s cubic-bezier(0.61,-0.19, 0.7,-0.11),
flex 0.7s cubic-bezier(0.61,-0.19, 0.7,-0.11),
background 0.2s;
display: flex;
justify-content: center;
flex-direction: column;
}
.panel1 { background-image:url(https://source.unsplash.com/gYl-UtwNg_I/1500x1500); }
.panel2 { background-image:url(https://source.unsplash.com/rFKUFzjPYiQ/1500x1500); }
.panel3 { background-image:url(https://images.unsplash.com/photo-1465188162913-8fb5709d6d57?ixlib=rb-0.3.5&q=80&fm=jpg&crop=faces&cs=tinysrgb&w=1500&h=1500&fit=crop&s=967e8a713a4e395260793fc8c802901d); }
.panel4 { background-image:url(https://source.unsplash.com/ITjiVXcwVng/1500x1500); }
.panel5 { background-image:url(https://source.unsplash.com/3MNzGlQM7qs/1500x1500); }
.panel > * {
margin: 0;
width: 100%;
transition: transform 0.8s;
flex: 1;
display: flex;
justify-content: center;
align-items: center;
}
.panel > *:first-child { transform: translateY(-100%); }
.panel.open-active > *:first-child { transform: translateY(0); }
.panel > *:last-child { transform: translateY(100%); }
.panel.open-active > *:last-child { transform: translateY(0); }
.panel p {
text-transform: uppercase;
font-family: 'Amatic SC', cursive;
text-shadow: 0 0 4px rgba(0, 0, 0, 0.72), 0 0 14px rgba(0, 0, 0, 0.45);
font-size: 2em;
}
.panel p:nth-child(2) {
font-size: 4em;
}
.panel.open {
font-size: 40px;
flex: 4;
}
</style>
<div class="panels">
<div class="panel panel1">
<p>Hey</p>
<p>Let's</p>
<p>Dance</p>
</div>
<div class="panel panel2">
<p>Give</p>
<p>Take</p>
<p>Receive</p>
</div>
<div class="panel panel3">
<p>Experience</p>
<p>It</p>
<p>Today</p>
</div>
<div class="panel panel4">
<p>Give</p>
<p>All</p>
<p>You can</p>
</div>
<div class="panel panel5">
<p>Life</p>
<p>In</p>
<p>Motion</p>
</div>
</div>
<script>
;(function () {
const panels = document.querySelectorAll(".panel")
console.log(panels)
function mouseHandler(e){
console.log(e)
this.classList.toggle("open");
this.classList.toggle("open-active")
}
function outHandler() {
this.classList.remove('open')
this.classList.remove("open-active")
}
function transitionHandler(e) {
if(e.propertyName.includes('flex')){
this.classList.toggle('open-active')
}
}
panels.forEach((panel) =>{
panel.addEventListener("mouseover", mouseHandler);
panel.addEventListener("mouseout", outHandler);
// panel.addEventListener("transitionend",transitionHandler)
})
})()
</script>
</body>
</html>
