1 <html> 2 <head> 3 <meta charset="UTF-8"> 4 <title>Document</title> 5 </head> 6 <body> 7 <input type="file" name="contractFileName" style=" 500px;" onchange="fileChange(this);"/> 8 9 <script type="text/javascript"> 10 var isIE = /msie/i.test(navigator.userAgent) && !window.opera; 11 function fileChange(target,id) { 12 var fileSize = 0; 13 var filetypes =[".jpg",".png",".rar",".txt",".zip",".doc",".ppt",".xls",".pdf",".docx",".xlsx"]; 14 var filepath = target.value; 15 var filemaxsize = 1024*2;//2M 16 if(filepath){ 17 var isnext = false; 18 var fileend = filepath.substring(filepath.lastIndexOf(".")); 19 if(filetypes && filetypes.length>0){ 20 for(var i =0; i<filetypes.length;i++){ 21 if(filetypes[i]==fileend){ 22 isnext = true; 23 break; 24 } 25 } 26 } 27 if(!isnext){ 28 alert("不接受此文件类型！"); 29 target.value =""; 30 return false; 31 } 32 }else{ 33 return false; 34 } 35 if (isIE && !target.files) { 36 var filePath = target.value; 37 var fileSystem = new ActiveXObject("Scripting.FileSystemObject"); 38 if(!fileSystem.FileExists(filePath)){ 39 alert("附件不存在，请重新输入！"); 40 return false; 41 } 42 var file = fileSystem.GetFile (filePath); 43 fileSize = file.Size; 44 } else { 45 fileSize = target.files[0].size; 46 } 47 48 var size = fileSize / 1024; 49 if(size>filemaxsize){ 50 alert("附件大小不能大于"+filemaxsize/1024+"M！"); 51 target.value =""; 52 return false; 53 } 54 if(size<=0){ 55 alert("附件大小不能为0M！"); 56 target.value =""; 57 return false; 58 } 59 } 60 </script> 61 62 </body> 63 </html>