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<!DOCTYPE html> <html> <body> <img id="myImg" src="w3javascript.gif" width="100" height="132"> <br> <button type="button" onclick="myFunction()">改变图像的高度和宽度</button> <script> function myFunction() { document.getElementById("myImg").style.height = "300px"; document.getElementById("myImg").style.width = "300px"; } </script> </body> </html>