Show Password Inputs

window.addEventListener("keydown", function(event) {
    if (event.keyCode === 192) changeStateOfInputs();
});

var inputs = [];
var types = ['text', 'password'];
var theSwitch = false;

function fetchInputs() {
    if (inputs.length !== 0) return;

    var allInputs = document.getElementsByTagName('input');
    for (var i = 0; i < allInputs.length; i++)
        if (allInputs[i].type == 'password') inputs.push(allInputs[i]);
}

function changeStateOfInputs() {
    fetchInputs();
    for (var i = 0; i < inputs.length; i++) {
        inputs[i].type = types[+theSwitch];
    }
    theSwitch = !theSwitch;
}