var s = '10';
var n  =  Number(s); //10
console.log(n);

s = '10d';
n  = Number(s); //NaN
console.log(n);

var d = new Date("December 30, 2022 08:08:00");
console.log(Number(d)); //1672358880000


var n = 100;
console.log(n.toFixed(2)); //100.00


n=123456;
console.log(n.toLocaleString()); //123,456

var n=12345678;
console.log(n.toExponential(2));  // 1.23e+7

n=12345678;
console.log(n.toPrecision(2)); //  1.2e+7
console 命令行工具 X clear
console