JSFiddle - React, Tailwind, and code Playground

HTML

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

JavaScript

function myFunc(){
    x1 = "總裁鐵大海綿寶寶";
    document.getElementById("demo").innerHTML = x1;
}

function myFunc2(){
    console.log("x1= " + x1);
    console.log("x1= " + window.x1);
    console.log("x1= " + this.x1);
}

myFunc();
myFunc2();