批量压缩图片优化网站速度

注意1：图片压缩后会覆盖 原始图片

注意2：目录不能带 中文

注意3：56行注译掉 子目录 将不会被压缩（其它说明看代码的注译）

// Open a given folder and compress all PNG and JPEG images with Tinify.
// Copyright (c) 2015 Voormedia B.V. All rights reserved.
 
function compressFile(file, percentage) {
    try {
        // Open the file without dialogs like Adobe Camera Raw
        var opener = new ActionDescriptor();
        opener.putPath(charIDToTypeID("null"), file);
        executeAction(charIDToTypeID("Opn "), opener, DialogModes.NO);
 
        // Select the opened document
        var document = app.activeDocument;
 
        // 色彩类型，默认：RGB
        if (document.mode == DocumentMode.INDEXEDCOLOR) {
            document.changeMode(ChangeMode.RGB);
        }
 
        // 图像位深，默认：8位
        if (document.bitsPerChannel == BitsPerChannelType.SIXTEEN) {
            convertBitDepth(8);
        }
 
        // 压缩百份比，默认：100
        if (percentage === undefined || percentage < 10 || percentage > 100) {
            percentage = 100;
        }
 
        // Compress the document
        var tinify = new ActionDescriptor();
        tinify.putPath(charIDToTypeID("In  "), file); // 覆盖原始图片
        tinify.putUnitDouble(charIDToTypeID("Scl "), charIDToTypeID("#Prc"), percentage );
 
        var compress = new ActionDescriptor();
        compress.putObject(charIDToTypeID("Usng"), charIDToTypeID("tinY"), tinify);
        executeAction(charIDToTypeID("Expr"), compress, DialogModes.NO);
 
        document.close(SaveOptions.DONOTSAVECHANGES);
    } catch (e) {}
}
 
function convertBitDepth(bitdepth) {
    var id1 = charIDToTypeID("CnvM");
    var convert = new ActionDescriptor();
    var id2 = charIDToTypeID("Dpth");
    convert.putInteger(id2, bitdepth);
    executeAction(id1, convert, DialogModes.NO);
}
 
function compressFolder(folder) {
    // Recursively open files in the given folder
    var children = folder.getFiles();
    for (var i = 0; i < children.length; i++) {
        var child = children[i];
        if (child instanceof Folder) {
            compressFolder(child);/* 注译此行将不会压缩 子目录 */
        } else {
            if ((child.name.slice(-4).toLowerCase() == ".png")||(child.name.slice(-5).toLowerCase() == ".jpeg")||(child.name.slice(-4).toLowerCase() == ".jpg")) {
                compressFile(child);
            }
        }
    }
}
 
if (confirm("Warning. You are about to compress all JPEG and PNG files in the chosen folder. This cannot be undone.\n\rAre you sure you want to continue?")) {
    try {
        // Let user select a folder
        compressFolder(Folder.selectDialog("Choose a folder with JPEG/PNG images to compress with TinyPNG/JPG"));
        alert("All JPEG and PNG files compressed.");
    } catch(error) {
        alert("Error while processing: " + error);
    }
}

压缩完后，可能你会需要一个图片重命名脚本。