W3School TIY Editor
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<!DOCTYPE html> <html> <body> <p id="demo"></p> <script> var w = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth; var h = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight; var x = document.getElementById("demo"); x.innerHTML = "浏览器内窗宽度：" + w + "，高度：" + h + "。"; </script> </body> </html>