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JS 参考手册
Image naturalWidth 属性
tryjsref_img_naturalwidth_width
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<!DOCTYPE html> <html> <body> <img id="myImg" src="/demo/images/compman.gif" style="width:500px;height:98px;"> <p>Click the button to return the original width and the "new/styled" width of the image.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <p id="demo2"></p> <script> function myFunction() { var x = document.getElementById("myImg").naturalWidth; document.getElementById("demo").innerHTML = "The original width of the image is: " + x + " pixels"; var y = document.getElementById("myImg").width; document.getElementById("demo2").innerHTML = "The ''styled'' width of the image is: " + y + " pixels"; } </script> </body> </html>