<html><body><h1>Window 对象</h1><h2>focus() 方法</h2><p>单击按钮打开一个新窗口，并为其设置焦点。</p><button onclick="myFunction()">试一试</button><script>function myFunction() { const myWindow = window.open("", "", "width=200,height=100"); myWindow.focus();}</script></body></html>