how to reduce jpeg file size

To the Forum, blog, Taobao and other online shop upload pictures, often pop-up a prompt box, "You upload the picture size exceeds the limit", "Upload the picture size limit within 200K" and so on. In this case, the general practice is to crop the size of the picture to reduce the

(var i in extensions) { var ext = extensions[i]; if(ext in mime_types) { var mime = mime_types[ext]; if($.isArray(mime)) { jQuery.merge(mimes , mime); } else { mimes.push(mime); } } } return mimes; } Here, we will pass in the ZIP and PNG types, and then return the MIME/TYPE corresponding to these types of files, f

This article is saved as an. html file opened in a browser to test functionality function check () { var aa= document.getElementById ("UserFile"). Value.tolowercase (). Split ('. '); /with "." Separate the upload file string //var aa=document.form1.userfile.value.tolowercase (). Split ('. '); /with "." Separate upload file string if (docume

your execution file text paragraph may be exceeded. Therefore, most of the optimization purpose is to reduce the total size of the native folder, according to experience, here to reduce about 5m, the execution of the text section can reduce 1m.Specific technical detailsTher

Copy codeThe Code is as follows:// Check the file size and typeFunction fileChange (target ){// Check the type of the uploaded fileIf (! (/(? : Jpg | gif | png | jpeg) $/I. test (target. value ))){Alert ("only jpg files can be uploaded | gif | png | jpeg images ");If (window. ActiveXObject) {// for IETarget. select ();

Multiple upload files use js to verify the file format and size (recommended ). Html section: Note: The Upload file must have an id, and an id name should be added to the onchage event; Js section: // Detaches verification settings and error messages, facilitating the final submission of var flag = true; var errorinfo = ""; // verifies the

During file upload, in order to achieve the asynchronous upload effect, iframe is usually used for file upload, but we cannot process the data returned by the server like ajax, so as to determine the file size and file style, we generally think that when we upload files, in

(i) Control of file types This is just a demonstration of the type of picture control, other controls need to see webroot/fckeditor/editor/dialog/below the corresponding JS file fckeditor.properties Writing Reference fckeditor-java-core-2.4.1.jar/net.fckeditor.handlers/net.fckeditor.handlers/ Default.properties fileMyconfig.js Writing Reference Webroot/fckeditor/fckconfig.js

. Of course, change the file name. HTA will block the security prompt, but it is difficult to obtain it.Not recommended, not to mention Next, let's talk about another method. There is an IMG tag in the HTML Tag that is not "deep" for general developers. let's first talk about its attributes: SRC, DYNSRC, start, ALT, controls, loop, loopdelay, hspace, vspace .... some commonly used attributes will not be listed. Here we will talk about the "DYNSRC"

) ! Window. Opera; functionFilechange(Target) { VarFileSize= 0; If (Isie !Target.Files) { VarFilePath=Target.Value; VarFileSystem= New ActiveXObject("Scripting.FileSystemObject"); VarFile=FileSystem.GetFile (FilePath);FileSize=File.Size; } Else {FileSize=Target.Files[0].Size; } VarSize=FileSize/ 1024; If(Size>2000){Alert("Attachment cannot be greater than 2M");Target.Value=""; Return }

Bask It's ready to be compiled into components, and PNG is supported. ' I have released this source code into the public domain. Use it ' With no strings attached. ' Just call getimagesize with a string containing the filename, and ' It'll return a user defined type ' imagesize ' ("below") ' Return values of 0 indicate an error of some sort. The error handling ' In this module is limited. There is *no* error handling on the test ' Form. This routine are limited to X or Y sizes of 32767 pixels

We do file upload, in order to achieve the effect of asynchronous uploads, will generally choose to use the form of IFrame to upload files, but we can not like Ajax to the server-side returned data processing, so as to file size and file style judgments, So we generally think of using JS to upload the

With the rapid development of the business, Lucene-based index file zip compression is also close to the GB magnitude, while keeping the index file size as an acceptable range is very necessary, not only can improve the index transfer, read speed, It also improves the efficiency of the index cache (Lucene caches the index fil