<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
#box{
width: 250px;
height: 52px;
margin: 30px auto;
padding: 15px 30px;
border: 2px solid #ccc;
border-radius: 15px;
}
#box .count{
width: 60px;
color: #666;
font-size: 280%;
line-height: 50px;
margin-left: 5px;
padding-left: 6px;
border: 1px solid #fff;
}
#box div{
width: 50px;
height: 50px;
border-radius: 50px;
border: 1px solid #666;
float: left;
margin-left: 5px;
}
.gray{
background-color: #eee;
}
.red{
background-color: red;
}
.green{
background-color: #26ff00;
}
.yellow{
background-color: yellow;
}
</style>
</head>
<body>
<div id="box">
<div id="red"></div>
<div id="yellow"></div>
<div id="green"></div>
<div id="count" class="count"></div>
</div>
<script>
var lamp = {
red:{
obj:document.getElementById("red"),
timeout:3,
style:["red","gray","gray"],
next:"green"
},
yellow:{
obj:document.getElementById("yellow"),
timeout:5,
style:["gray","yellow","gray"],
next:"red"
},
green:{
obj:document.getElementById("green"),
timeout:3,
style:["gray","gray","green"],
next:"yellow"
},
changeStyle(style){
this.red.obj.className=style[0];
this.yellow.obj.className=style[1];
this.green.obj.className=style[2];
}
};
//倒计时
var count = {
obj:document.getElementById("count"),
change:function(num){
this.obj.innerHTML = (num<10) ? ("0"+num) : num ;//this表示的是count
}
};
//初始状态
var now = lamp.green;
var timeout = now.timeout;
lamp.changeStyle(now.style);
count.change(timeout);
setInterval(function(){
if(--timeout<=0){
now = lamp[now.next];
timeout = now.timeout;
lamp.changeStyle(now.style);
}
count.change(timeout);
},1000);
</script>
</body>
</html>
