JS基本数据类型

基本数据类型

1. Number
2. String
3. Boolean
4. undefined
5. Null
6. Symbol
7. Bigint

其中 6，7为新增属性简单了解即可

Symbol 它的值是唯一的

let symData0 = Symbol('symdata') 
let symData1 = Symbol('symdata') 

console.log(symData0 === symData1) //false

Bigint 大的整数使用

 let max = Number.MAX_SAFE_INTEGER; //最大安全整数
        console.log(max);  // 9007199254740991
        let max0= max + 1;  // 9007199254740992
        let max1= max + 2;  // 9007199254740993
        console.log(max0;
        console.log(max0=== max1; // true
        let maxs = BigInt(Number.MAX_SAFE_INTEGER);
        //    let maxs0 = maxx + 1;  // 会报错
        // let maxs0 = maxs + 1n;  // 会报错
        let maxs0 = maxs + BigInt(1);  
        let maxs1 = maxs + BigInt(2);
        console.log(maxs0);
        console.log(maxs0 === maxs1); // false