Window：focus() 方法
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
发出将窗口置顶的请求。用户设置可能导致此操作失败，并且在方法返回之前并不能保证窗口已处于最前端。
语法
js
focus()
参数
无。
返回值
无（undefined）。
示例
js
if (clicked) {
window.focus();
}
规范
| Specification |
|---|
| HTML # dom-window-focus-dev |