JSFiddle - React, Tailwind, and code Playground

JavaScript

function isEvent(ev)
    {
    var d=document;
    var isTrue=false;
    var fn=function()
    {
            isTrue=true;
    }
    d.body.onclick=fn;
    var e;
    if(d.createEvent)
    {
        e=d.createEvent('Event');
        e.initEvent(ev,false,false);
        d.body.dispatchEvent(e);
    }
    else if(d.createEventObject)
    {
        e=d.createEventObject(window.event);
        d.body.fireEvent('on'+ev,e);
    }
    return isTrue;
}

    //run the code
    var isMouse=isEvent('click');
    if(isMouse)
    {
        alert('user has a mouse');
    }