问如何在不重新加载页面的情况下使.one ()方法再次工作

EN

// Returns a function that will call its callback argument 
// only when a certain delay has passed. Another callback
// can be called to notify that the delay has expired
function throttle(f, milliseconds, ready = () => null) {
    let timer = -1;
    
    return function () {
        if (timer === -1) f();
        clearTimeout(timer);
        timer = setTimeout(function () {
            timer = -1;
            ready();
        }, milliseconds);
    }
}

function sendMessage(msg) {
    $("div").text("typing...");
}

function clearMessage() {
    $("div").text("");
}

$("textarea").on('input', throttle(sendMessage, 3000, clearMessage));

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<textarea></textarea>
<div></div>

const textArea = document.querySelector('.area')
const indicator = document.querySelector('.indicator')
let timeout = null

textArea.addEventListener('input', function() {
  clearTimeout(timeout)

  indicator.innerText = 'Typing...'

  timeout = setTimeout(function() {
    indicator.innerText = ''
  }, 300)
})

.area,
.indicator {
  display: block;
  margin: 1rem;
}

<textarea class="area"></textarea>
<span class="indicator"></span>