应用了javascript和在IE下img本身的fileSize属性。另外img还有其他的几个属性,如fileCreatedDate、fileModifiedDate、fileSize、fileUpdatedDate、filters,我们可以通过这些属性来获取图片文件的部分信息,如文件大小,我们用file表单同img标签结合,就能够在上传之前判断图片文件的大小是否合法了。
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;}
//-->
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