<!DOCTYPE html><html> <head> <meta charset="UTF-8"> <title>全局變量的用法</title> <script type="text/javaScript"> window.onload = function(){ function fn1(){ var a = b = 2; console.log(a); console.log(b); } fn1(); console.log(b); function fn2(n){ a = n; console.log(a); } fn2(4); console.log(a); } </script> </head> <body> </body></html>
代碼如下，請問為什么最后兩個console得到的是4和4
熱愛生活_熱愛編程
2019-03-12 09:54:41
