<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <script> function t1(age) { console.log(age); var age=27; console.log(age); function age() { console.log(age) } } t1(3); //此法分析 // 1.形式参数 // AO.age = 3; // 2.局部变量 // AO.age = undefined // 3.函数声明表达式 // AO.age = function() </script> </body> </html>