const

使用const的注意事项

1.const声明的标识符所绑定的值是不可再次改变的
2.ES6 const的其他行为和let一样

const BUFFER_SIZE = 1024;

let buffer = new ArrayBuffer(BUFFER_SIZE);
console.log(buffer);

let data = new Uint16Array(buffer);
let data2 = new Uint8Array(buffer);

data[0] = 0xff06;

console.log(data2[0],data2[1]);
//BUFFER_SIZE=1;报错

var A=Object.freeze({a:1});
A.a=2;
A.b=3;
console.log(A);