<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>