页面开始的时候就运行，效果图：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
.big {
width: 100px;
height: 100px;
background: skyblue;
display: flex;
margin-top: 20px;
}
.small {
width: 10px;
height: 10px;
background: purple;
border-radius: 5px;
}
.one {
display: flex;
justify-content: center;
align-items: center;
}
.two {
display: flex;
justify-content: space-around;
align-items: center;
}
.two2 {
display: flex;
flex-direction: column;
justify-content: space-around;
align-items: center;
}
.three {
display: flex;
flex-direction: column;
justify-content: space-between;
align-items: center;
}
.four {
display: flex;
justify-content: space-around;
}
.four1 {
display: flex;
justify-content: space-around;
align-items: center;
}
.four2 {
display: flex;
flex-direction: column;
justify-content: space-around;
align-items: center;
}
.five {
display: flex;
justify-content: space-around;
}
.five1 {
display: flex;
flex-direction: column;
justify-content: space-around;
align-items: center;
}
.five2 {
display: flex;
flex-direction: row;
align-self: center;
}
.six {
display: flex;
justify-content: space-around;
}
.six1 {
display: flex;
flex-direction: column;
justify-content: space-around;
align-items: center;
}
</style>
</head>
<body>
<div class="big one">
<div class="small"></div>
</div>
<div class="big two">
<div class="small"></div>
<div class="small"></div>
</div>
<div class="big two2">
<div class="small"></div>
<div class="small"></div>
</div>
<div class="big three">
<div class="small" style="align-self: flex-start;"></div>
<div class="small" style="align-self: center;"></div>
<div class="small" style="align-self: flex-end;"></div>
</div>
<div class="big three">
<div class="small" style="align-self: flex-end;"></div>
<div class="small" style="align-self: center;"></div>
<div class="small" style="align-self: flex-start;"></div>
</div>
<div class="big four">
<div class="four2">
<div class="small"></div>
<div class="small"></div>
</div>
<div class="four2">
<div class="small"></div>
<div class="small"></div>
</div>
</div>
<div class="big five">
<div class="five1">
<div class="small"></div>
<div class="small"></div>
</div>
<div class="five2">
<div class="small"></div>
</div>
<div class="five1">
<div class="small"></div>
<div class="small"></div>
</div>
</div>
<div class="big six">
<div class="six1">
<div class="small"></div>
<div class="small"></div>
<div class="small"></div>
</div>
<div class="six1">
<div class="small"></div>
<div class="small"></div>
<div class="small"></div>
</div>
</div>
<div class="big six">
<div class="six1">
<div class="small"></div>
<div class="small"></div>
</div>
<div class="six1">
<div class="small"></div>
<div class="small"></div>
</div>
<div class="six1">
<div class="small"></div>
<div class="small"></div>
</div>
</div>
<input type="button" value="开始" onclick="start()" />
<input type="button" value="结束" onclick="stop()" />
</body>
<script>
var interval;
var i = 0;
window.onload=start();
function start () {
var num = document.getElementsByClassName("big");
interval= setInterval(function function_name () {
for(var j = 0;j<num.length;j++){
if(j==i){
num[j].style.display="flex";
}
else{
num[j].style.display="none";
}
}
i++;
if(i==num.length){
i=0;
}
},1000)
}
function stop () {
clearInterval(interval);
}
</script>
</html>
