<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> let a = 10; const b = 20; let c = a+b; a = "hello"; b = 111; // const 定义的是常量 不能修改 console.log(a,c,b); </script> </body> </html>
