js判断文件格式及大小
//判断照片大小 function getPhotoSize(obj){ photoExt=obj.value.substr(obj.value.lastIndexOf( "." )).toLowerCase(); //获得文件后缀名 if (photoExt!= '.jpg' ){ alert( "请上传后缀名为jpg的照片!" ); return false ; } var fileSize = 0; var isIE = /msie/i.test(navigator.userAgent) && !window.opera; if (isIE && !obj.files) { var filePath = obj.value; var fileSystem = new ActiveXObject( "Scripting.FileSystemObject" ); var file = fileSystem.GetFile (filePath); fileSize = file.Size; } else { fileSize = obj.files[0].size; } fileSize=Math.round(fileSize/1024*100)/100; //单位为KB if (fileSize>=10){ alert( "照片最大尺寸为10KB,请重新上传!" ); return false ; } } |
jsp页面:
< input type="file" id="imgFile" name="upload" style="width:150px;" onchange="getPhotoSize(this)"/> |