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<!DOCTYPE html> <html> <body> <h2>JavaScript addEventListener()</h2> <p>此示例对窗口对象使用 addEventListener() 方法。</p> <p>尝试调整此浏览器窗口的大小来触发“resize”事件处理程序。</p> <p id="demo"></p> <script> window.addEventListener("resize", function(){ document.getElementById("demo").innerHTML = Math.random(); }); </script> </body> </html>