客户端js判断文件类型和文件大小即限制上传大小
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <script type="text/javascript"> var isIE = /msie/i.test(navigator.userAgent) && !window.opera; function fileChange(target, id) { var fileSize = 0; var filetypes = [".jpg", ".png", ".rar", ".txt", ".zip", ".doc", ".ppt", ".xls", ".pdf", ".docx", ".xlsx"]; var filepath = target.value; var filemaxsize = 1024 * 2; //2M if (filepath) { var isnext = false; var fileend = filepath.substring(filepath.indexOf(".")); if (filetypes && filetypes.length > 0) { for (var i = 0; i < filetypes.length; i++) { if (filetypes[i] == fileend) { isnext = true; break; } } } if (!isnext) { alert("不接受此文件类型!"); target.value = ""; return false; } } else { return false; } if (isIE && !target.files) { var filePath = target.value; var fileSystem = new ActiveXObject("Scripting.FileSystemObject"); if (!fileSystem.FileExists(filePath)) { alert("附件不存在,请重新输入!"); return false; } var file = fileSystem.GetFile(filePath); fileSize = file.Size; } else { fileSize = target.files[0].size; } var size = fileSize / 1024; if (size > filemaxsize) { alert("附件大小不能大于" + filemaxsize / 1024 + "M!"); target.value = ""; return false; } if (size <= 0) { alert("附件大小不能为0M!"); target.value = ""; return false; } } </script> </head> <body> <input type="file" name="contractFileName" style="width: 500px;" onchange="fileChange(this);"/> </body> </html>
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