使用JavaScript实现红绿灯切换
这个方法不建议用,es6已经不允许使用callee了,只是当练习了解一下callee
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<script>
function getLight(first,second,third){
first(second,third);
}
function getRedLight(fn,fn1){
var f=arguments.callee;
var ids=setTimeout(function(){
console.log("红灯");
clearTimeout(ids);
fn(fn1,f);
},1000);
}
function getYellowLight(fn,fn1){
var f=arguments.callee;
var ids=setTimeout(function(){
console.log("黄灯");
clearTimeout(ids);
fn(fn1,f);
},1000);
}
function getGreenLight(fn,fn1){
var f=arguments.callee;
var ids=setTimeout(function(){
console.log("绿灯");
clearTimeout(ids);
fn(fn1,f);
},1000);
}
getLight(getGreenLight,getYellowLight,getRedLight);
</script>
</body>
</html>
实现效果如下,在控制台可以每秒打印不同的灯
