How to delete linked files via script

Hi @Brother Li, try this:

/**
 * @discussion: https://community.adobe.com/t5/illustrator-discussions/how-to-delete-linked-files-via-script/m-p/13267350
 * @version 2022-10-15 - works with Chinese file name, correctly handles 'Documents' object, handles RasterItems.
 */
(function () {

    // the filename to remove:
    var removeThis = '二维码.jpg';

    // remove from:
    var allOpenDocuments = app.documents;
    var activeDocument = app.activeDocument;

    var count = removePlacedItem(removeThis, allOpenDocuments);

    // show result:
    // alert('Removed ' + count + ' placed items of "' + removeThis + '".')


    /**
     * Searches document(s) for PlacedItems
     * and RasterItems (that have a file
     * property) matching a supplied filename
     * and removed them from the document.
     * @author m1b
     * @version 2022-10-16
     * @param {String} name - the linked file name to target.
     * @param {Document|Documents} docs - one or more Illustrator Documents.
     * @returns {Number} - the count of removed placedItems.
     */
    function removePlacedItem(name, docs) {

        if (docs.typename == 'Document')
            docs = [docs];

        var count = 0;

        for (var i = 0; i < docs.length; i++) {

            var doc = docs[i];

            // placed items (linked files)
            for (var j = doc.placedItems.length - 1; j >= 0; j--) {

                var itemName = doc.placedItems[j].file.fsName.split('/');
                itemName = itemName[itemName.length - 1];

                if (itemName == name) {
                    doc.placedItems[j].remove();
                    ++count;
                }

            }

            // raster items (embedded linked files)
            for (var j = doc.rasterItems.length - 1; j >= 0; j--) {

                if (!doc.rasterItems[j].hasOwnProperty('file'))
                    continue;

                var itemName = doc.rasterItems[j].file.fsName.split('/');
                itemName = itemName[itemName.length - 1];

                if (itemName == name) {
                    doc.rasterItems[j].remove();
                    ++count;
                }

            }

        }

        return count;

    };

})();

- Mark

EDIT: fixed for Chinese file names. Fixed for problem handling Documents object, and added support for RasterItems.

Delete linked layers based on link name