摘要：
：jpg|gif|png|jpeg）$/i.test））｛5alert；6if｛//forIE7target.select（）；//selectthefile，and clearselection8document.selection.clear（））；9｝elseif｛//foroperata10target.type=“text”；target.type:“file”；11｝elsetarget.value=“”；//FF、Chrome、Safari2return；13} 否则｛14return；//alert；//或您无能为力。15｝1617//检测上载文件的大小18variasIE=/msie/i.test&&！
1 //检测文件大小和类型 2 function fileChange(target){ 3 //检测上传文件的类型 4 if(!(/(?:jpg|gif|png|jpeg)$/i.test(target.value))) { 5 alert("只允许上传jpg|gif|png|jpeg格式的图片"); 6 if(window.ActiveXObject) {//for IE 7 target.select();//select the file ,and clear selection 8 document.selection.clear(); 9 } else if(window.opera) {//for opera 10 target.type="text";target.type="file"; 11 } else target.value="";//for FF,Chrome,Safari 12 return; 13 } else { 14 return; //alert("ok");//or you can do nothing here. 15 } 16 17 //检测上传文件的大小 18 var isIE = /msie/i.test(navigator.userAgent) && !window.opera; 19 var fileSize = 0; 20 if (isIE && !target.files){ 21 var filePath = target.value; 22 var fileSystem = new ActiveXObject("Scripting.FileSystemObject"); 23 var file = fileSystem.GetFile (filePath); 24 fileSize = file.Size; 25 } else { 26 fileSize = target.files[0].size; 27 } 28 var size = fileSize / 1024; 29 if(size>(500)){ 30 alert("文件大小不能超过500KB"); 31 if(window.ActiveXObject) {//for IE 32 target.select();//select the file ,and clear selection 33 document.selection.clear(); 34 } else if(window.opera) {//for opera 35 target.type="text";target.type="file"; 36 } else { 37 target.value="";//for FF,Chrome,Safari 38 } 39 return; 40 }else{ 41 return; 42 } 43 }