JSFiddle - React, Tailwind, and code Playground

JavaScript

arr1= [
    "http://www.page.com/q.html",
    "http://www.afaq.com/vb/showthread.php?t=77",
    "http://www.daniweb.com/web-development/javascript-dhtml-ajax"
];
arr2 = [
    "a.mp3",
    "b.wav",
    "c.rm",
    "d.wma",
    "http://www.page.com/q.html",
    "f.ram"
];

for (var i=0; i<arr1.length; i++) {
    var index = arr2.indexOf(arr1[i]);
    if (index >= 0) {
        document.write(arr1[i] + " in arr2 at index " + index + "<br/>");
    } else {
        document.write(arr1[i] + " not in arr2<br/>");
    }
}