Format penukaran dalam jquery

var time = "2021-05-01T00:00:00";
var date = new Date(time);
var year = date.getFullYear();
var month = date.getMonth() + 1;
var day = date.getDate();
var timeFormat = year + "-" + month + "-" + day;
console.log(timeFormat); //输出 2021-5-1

var time = "2021-05-01T00:00:00";
var date = new Date(time);
var year = date.getFullYear();
var month = date.getMonth() + 1;
var day = date.getDate();
var timeFormat = month + "/" + day + "/" + year;
console.log(timeFormat); //输出 5/1/2021

var num = 5000;
var currency = num.toLocaleString('en-US', {style: 'currency', currency: 'USD'});
console.log(currency); //输出 $5,000.00

var num = 0.75;
var percentage = (num * 100).toFixed(2) + "%";
console.log(percentage); //输出 75.00%

var str = "hello world";
var strUpperCase = str.toUpperCase();
console.log(strUpperCase); //输出 HELLO WORLD

var str = "HELLO WORLD";
var strLowerCase = str.toLowerCase();
console.log(strLowerCase); //输出 hello world