JSFiddle - React, Tailwind, and code Playground

HTML

<h1> 
    <p id="demo"> paragraph </p>
</h1>

JavaScript

var result = "結果",
    str = new String("總裁 海綿寶寶"),
    str1 = "總裁 海綿寶寶 鐵大";
    num = new Number(12345.12345),
    num1 = 12345.12345,
    b = new Boolean(false),
    bb = true,
    a = new Array("外獅佬","超人","大神");
    aa = ["外獅佬","超人","大神", "J大"],
    obj = {name: "海綿寶寶", address: "比奇堡"},
    s = JSON.stringify(obj),
    o = JSON.parse(s),
    r = new RegExp("[a-z]", "gim"),
    rr = /[a-z]/gim;

    result = str1.length;
    result = num1.toPrecision(12);
    result = bb.toString();
    result = aa.length;
    result = obj.name;
    result = s;
    result = o.address;
    result = "This is a book.".replace(rr, "Z");
    

document.getElementById("demo").innerHTML = result;