如何用javascript控制上传文件的大小

 

以下是引用片段： function CheckFileSize() { var FileMaxSize = 100;//限制上传的文件大小，单位(k) var s = document.RegForm.Img_1.value; //if(s==""){alert("No image,please select again!");document.RegForm.Img_1.focus(); return false;} var img = new Image(); img.src = s; if(img.fileSize>FileMaxSize*1024){alert("The file size exceeds " FileMaxSize "K，please choose a smaller one!");document.RegForm.Img_1.focus();return false;} //--></SCRIPT> <FORM action="**.asp" method="post" onSubmit="return CheckFileSize()" enctype="multipart/form-data" name="RegForm"> <input name="Next" type="submit" class="pBttn" id="Next" value="Save">

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