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<!DOCTYPE html> <html> <body> <h1>Document defaultView 属性</h1> <p>defaultView 属性返回当前窗口对象。</p> <p>返回窗口的宽度和高度：</p> <button onclick="myFunction()">获取窗口大小</button> <p id="demo"></p> <script> function myFunction() { var x = document.defaultView; var w = x.innerWidth; var h = x.innerHeight; document.getElementById("demo").innerHTML = "Width: " + w + "<br>Height: " + h; } </script> </body> </html>