Есть ли аналог var_dump из php и правильно ли я подгружаю другой js файл?

function follow() {
   document.getElementById("pop").innerHTML = "text777";
}
function follow1(){
    document.getElementById("pop").innerHTML = "text888";
}
function init() {
    var button = document.getElementById("button");
    if (button.addEventListener) {
       button.addEventListener('mouseover',follow);
    }
    var button1 = document.getElementById("button1");
    if (button1.addEventListener) {
       button1.addEventListener('mouseover',follow1);
    }
}

<script>
var framework = require("js.js");
</script>

function loadScript(url, callback)
{
    // Adding the script tag to the head as suggested before
    var head = document.getElementsByTagName('head')[0];
    var script = document.createElement('script');
    script.type = 'text/javascript';
    script.src = url;
 
    // Then bind the event to the callback function.
    // There are several events for cross browser compatibility.
    //script.onreadystatechange = callback;
    //script.onload = callback;
 
    // Fire the loading
    head.appendChild(script);
}
loadScript("js.js");