<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script type="text/javascript">
//第1题 作用域
var num1 = 55;
var num2 = 66;//100
function f1(num, num1) {
// var num =55;
// var num1 = 66;
num = 100;//100
num1 = 100;//100
num2 = 100;//100
console.log(num);//100
console.log(num1);//100
console.log(num2);//100
}
// 55 66
f1(num1, num2);
console.log(num1);//55
console.log(num2);//100
console.log(num);// 报错
</script>
</body>
</html>运行结果