<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>const 定义常量</title> </head> <body> <script> //声明常量 const SCHOOL = ‘尚硅谷‘; //1. 一定要赋初始值 // const A; //2. 一般常量使用大写(潜规则) // const a = 100; //3. 常量的值不能修改 // SCHOOL = ‘ATGUIGU‘; //4. 块儿级作用域 // { // const PLAYER = ‘UZI‘; // } // console.log(PLAYER); //5. 对于数组和对象的元素修改, 不算做对常量的修改, 不会报错 const TEAM = [‘UZI‘,‘MXLG‘,‘Ming‘,‘Letme‘]; // TEAM.push(‘Meiko‘); </script> </body> </html>
原文：https://www.cnblogs.com/juham/p/14892825.html