函数作用域与变量作用域差不多
参考变量作用域
http://www.cnblogs.com/xiaozhanga4/archive/2012/03/04/2379186.html
<!DOCTYPE HTML>
<html lang="en-US">
<head>
<meta charset="UTF-8">
<title>2.16.JavaScript.函数作用域</title>
</head>
<body>
<script type="text/javascript">
/*
var func = function(){
document.write("1 ");
}
func();
var func = function(){
document.write("2");
}
func();
*/
function func(){
document.write("3 ");
}
func();
function func(){
document.write("4");
}
func();
</script>
</body>
</html>