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資料來源：http://www.blueshop.com.tw/board/show.asp?subcde=BRD20090219135915SXD&fumcde=
特別感謝Bryan大大的提供
範常式式如下：
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=big5"> <title>上傳</title> </head> <body> <form ACTION="upload.asp" METHOD="POST" name="FileForm" enctype="multipart/form-data"> 圖片: <input type="file" name="file1" size="20" id="file1"> <input type="button" value="確定上傳" onClick="checkFile()"> </form> </body> </html> <script language="JavaScript"> //by Bryan(不來ㄣ)//這裡控制要檢查的項目，true表示要檢查，false表示不檢查 var isCheckImageType = true; //是否檢查圖片副檔名 var isCheckImageWidth = true; //是否檢查圖片寬度 var isCheckImageHeight = true; //是否檢查圖片高度 var isCheckImageSize = true; //是否檢查圖片檔案大小 var ImageSizeLimit = 100000; //上傳上限，單位:byte var ImageWidthLimit = 1200; //圖片寬度上限 var ImageHeightLimit = 1000; //圖片高度上限 function checkFile() { var f = document.FileForm; var re = /\.(jpg|gif)$/i; //允許的圖片副檔名 if (isCheckImageType && !re.test(f.file1.value)) { alert("只允許上傳JPG或GIF影像檔"); } else { var img = new Image(); img.onload = checkImage; img.src = f.file1.value; } } function checkImage() { if (isCheckImageWidth && this.width > ImageWidthLimit) { showMessage('寬度','px',this.width,ImageWidthLimit); } else if (isCheckImageHeight && this.height > ImageHeightLimit) { showMessage('高度','px',this.height,ImageHeightLimit); } else if (isCheckImageSize && this.fileSize > ImageSizeLimit) { showMessage('檔案大小','kb',this.fileSize/1000,ImageSizeLimit/1000); } else { document.FileForm.submit(); } } function showMessage(kind,unit,real,limit) { var msg = "您所選擇的圖片kind為 real unit\n超過了上傳上限 limit unit\n不允許上傳！" alert(msg.replace(/kind/,kind).replace(/unit/g,unit).replace(/real/,real).replace(/limit/,limit)); } </script>Start building with 50+ products and up to 12 months usage for Elastic Compute Service
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