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JS 参考手册
Window innerWidth 属性
tryjsref_win_innerheight1
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<!DOCTYPE html> <html> <body> <h1>The Window Object</h1> <h2>The innerWidth and innerHeight Properties</h2> <p id="demo"></p> <script> let w = innerWidth; let h = innerHeight; document.getElementById("demo").innerHTML = "Width: " + w + "<br>Height: " + h; </script> </body> </html>