homework/test.js

function Password(parent, open = false) {
    let inpPass = document.createElement("input");
    let checkBox = document.createElement("input");
    checkBox.setAttribute("type", "checkbox");
    if (open) checkBox.setAttribute("checked", "checked");
    let text = document.createElement("span");
    text.innerText = "view";

    this.setValue = function (value) {
        inpPass.value = value;
    };

    this.getValue = function () {
        return inpPass.value;
    };

    var test = () =>
        checkBox.checked
            ? (inpPass.type = "text")
            : (inpPass.type = "password");

    this.setOpen = function () {
        checkBox.checked;
        test();
    };

    this.getOpen = function () {
        return checkBox.checked;
    };

    inpPass.oninput = () => {
        this.onChange();
    };

    checkBox.onclick = () => {
        test();
        this.onOpenChange(checkBox.checked);
    };

    parent.append(inpPass);
    parent.append(checkBox);
    parent.append(text);
}

let p = new Password(document.body, true);

p.onOpenChange = (open) => console.log(open);