JSFiddle - React, Tailwind, and code Playground

HTML

<label for="password">Password</label>
<input type="password" id="password"/><br/><br/>
<button type="button" id="pwdButton">Store password in window.password</button>

<script>
    function getContentsOfPasswordField() {
        return jQuery("input#password").val();
    }

    jQuery("button#pwdButton").on("click", function() {
        window.password = getContentsOfPasswordField();
        alert("'" + password + "' stored in global var window.password")
    });
</script>