Plugin not working

[monyarm]

// Script

function endsWith(suffix) {
    return this.indexOf(suffix, this.length - suffix.length) !== -1;
}

function evalScript(url) {
    var xhr = new XMLHttpRequest();
    if (url.endsWith(".gz")) {
        xhr.setRequestHeader("Content-Encoding", "deflate");
    } else {}
    xhr.open('GET', url);
    xhr.onload = function() {
        if (xhr.status < 400) {
            console.log(xhr.responseText);
        }
    };
    xhr.send(null);
    var script = xhr.responseText;
    console.log(script);
    eval(script);
}

What its supposed to do is evaluate the js file its given (eval() is what the "Script" event command uses) but instead nothing happens. I also checked the console and there arent any errors