Element：compositionend 事件

addEventListener("compositionend", (event) => { })

oncompositionend = (event) => { }

const inputElement = document.querySelector('input[type="text"]');

inputElement.addEventListener("compositionend", (event) => {
  console.log(`生成的字符为：${event.data}`);
});

<div class="control">
  <p>先选中文本框，然后打开输入法：</p>
  <ul>
    <li>在 macOS 上按 <kbd>option</kbd> + <kbd>`</kbd></li>
    <li>在 Windows 上按 <kbd>windows</kbd> + <kbd>.</kbd></li>
  </ul>
  <label for="example">示例输入</label>
  <input type="text" id="example" name="example" />
</div>

<div class="event-log">
  <label for="eventLog">事件日志：</label>
  <textarea
    readonly
    class="event-log-contents"
    rows="8"
    cols="25"
    id="eventLog"></textarea>
  <button class="clear-log">清除</button>
</div>

body {
  padding: 0.2rem;
  display: grid;
  grid-template-areas: "control log";
}

.control {
  grid-area: control;
}

.event-log {
  grid-area: log;
}

.event-log-contents {
  resize: none;
}

label,
button {
  display: block;
}

input[type="text"] {
  margin: 0.5rem 0;
}

kbd {
  border-radius: 3px;
  padding: 1px 2px 0;
  border: 1px solid black;
}

const inputElement = document.querySelector('input[type="text"]');
const log = document.querySelector(".event-log-contents");
const clearLog = document.querySelector(".clear-log");

clearLog.addEventListener("click", () => {
  log.textContent = "";
});

function handleEvent(event) {
  log.textContent += `${event.type}: ${event.data}\n`;
}

inputElement.addEventListener("compositionstart", handleEvent);
inputElement.addEventListener("compositionupdate", handleEvent);
inputElement.addEventListener("compositionend", handleEvent);