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JS 参考手册
Image complete 属性
tryjsref_img_complete2
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<!DOCTYPE html> <html> <head> <script> function myFunction() { alert("Image loaded: " + document.getElementById("myImg").complete); } </script> </head> <body onload="myFunction()"> <p>This property returns true if the image is finished loaded, and false if not.</p> <img id="myImg" src="/demo/images/compman.gif" alt="Computerman" width="107" height="98"> </body> </html>