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<!DOCTYPE html> <html> <body> <p>单击该按钮可显示屏幕的总宽度（以像素为单位）。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = "Total Width: " + screen.width + "px"; document.getElementById("demo").innerHTML = x; } </script> </body> </html>