Bigint: handles large numbers (integers of any length)

BigInt It's a special type of number , It supports integers of any length .
js The integer inside has a safe range , That is, the maximum display range , Exceeding this return may result in loss of precision

Example ：

let str = 1000 * Math.pow(10, 18);
console.log(str) //  The expected value is ：1000* 10 Of 18 Power 
 The resulting value is ：1e+21

solve
Use built-in objects BigInt(str)

str = BigInt(str)