- 13作用域链
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>13作用域链</title>
<script>
var num=10;
function f1(){
var num=20;
function f2(){
var num=30;
function f3(){
var num=50;
console.log("教师节,大家都过节");
console.log(num);//50(就近原则)
}
f3();
}
f2();
}
f1();
</script>
</head>
<body>
</body>
</html>
image.png
