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blur()

当元素失去焦点时，blur 事件将触发。

与 blur 相反的是 focus。

HTML

<p id="log">Click on this document to give it focus.</p>

Css

.paused {
  background: #ddd;
  color: #555;
}

JavaScript

function pause() {
  document.body.classList.add("paused");
  log.textContent = "FOCUS LOST!";
}

function play() {
  document.body.classList.remove("paused");
  log.textContent =
    "This document has focus. Click outside the document to lose focus.";
}

const log = document.getElementById("log");

window.addEventListener("blur", pause);
window.addEventListener("focus", play);

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