这里有一个解决方案。有一个小问题，因为它无法识别何时将图像添加到编辑器中。

1： 在plugins文件夹中创建一个名为tinymce autoresize的文件夹
2。在tinymce autoresize中创建名为tinymce_autoresize.php 使用此内容：

function intialize_autoresize_plugin() {
    // Check user permission
    if ( ! current_user_can(\'edit_posts\') && ! current_user_can(\'edit_pages\') )
        return;

    // Add only in Rich Editor mode
    if ( get_user_option(\'rich_editing\') == \'true\') {
        add_filter("mce_external_plugins", "autoresize_plugin_load");
    }
}

function autoresize_plugin_load($plugin_array) {
    $plug = WP_PLUGIN_URL . \'/tinymce-autoresize/editor_plugin.js\'; 
    $plugin_array[\'autoresize\'] = $plug;
    return $plugin_array;
    }

add_action(\'init\', \'intialize_autoresize_plugin\');

/**
 * editor_plugin_src.js
 *
 * Copyright 2009, Moxiecode Systems AB
 * Released under LGPL License.
 *
 * License: http://tinymce.moxiecode.com/license
 * Contributing: http://tinymce.moxiecode.com/contributing
 */

(function() {
    /**
     * Auto Resize
     *
     * This plugin automatically resizes the content area to fit its content height.
     * It will retain a minimum height, which is the height of the content area when
     * it\'s initialized.
     */
    tinymce.create(\'tinymce.plugins.AutoResizePlugin\', {
        /**
         * Initializes the plugin, this will be executed after the plugin has been created.
         * This call is done before the editor instance has finished it\'s initialization so use the onInit event
         * of the editor instance to intercept that event.
         *
         * @param {tinymce.Editor} ed Editor instance that the plugin is initialized in.
         * @param {string} url Absolute URL to where the plugin is located.
         */
        init : function(ed, url) {
            var t = this, oldSize = 0;

            if (ed.getParam(\'fullscreen_is_enabled\'))
                return;

            /**
             * This method gets executed each time the editor needs to resize.
             */
            function resize() {
                var deltaSize, d = ed.getDoc(), body = d.body, de = d.documentElement, DOM = tinymce.DOM, resizeHeight = t.autoresize_min_height, myHeight;

                // Get height differently depending on the browser used
                myHeight = tinymce.isIE ? body.scrollHeight : (tinymce.isWebKit && body.clientHeight == 0 ? 0 : body.offsetHeight);

                // Don\'t make it smaller than the minimum height
                if (myHeight > t.autoresize_min_height)
                    resizeHeight = myHeight;

                // If a maximum height has been defined don\'t exceed this height
                if (t.autoresize_max_height && myHeight > t.autoresize_max_height) {
                    resizeHeight = t.autoresize_max_height;
                    body.style.overflowY = "auto";
                    de.style.overflowY = "auto"; // Old IE
                } else {
                    body.style.overflowY = "hidden";
                    de.style.overflowY = "hidden"; // Old IE
                    body.scrollTop = 0;
                }

                // Resize content element
                if (resizeHeight !== oldSize) {
                    deltaSize = resizeHeight - oldSize;
                    DOM.setStyle(DOM.get(ed.id + \'_ifr\'), \'height\', resizeHeight + \'px\');
                    oldSize = resizeHeight;

                    // WebKit doesn\'t decrease the size of the body element until the iframe gets resized
                    // So we need to continue to resize the iframe down until the size gets fixed
                    if (tinymce.isWebKit && deltaSize < 0)
                        resize();
                }
            };

            t.editor = ed;

            // Define minimum height
            t.autoresize_min_height = parseInt(ed.getParam(\'autoresize_min_height\', ed.getElement().offsetHeight));

            // Define maximum height
            t.autoresize_max_height = parseInt(ed.getParam(\'autoresize_max_height\', 0));

            // Add padding at the bottom for better UX
            ed.onInit.add(function(ed){
                ed.dom.setStyle(ed.getBody(), \'paddingBottom\', ed.getParam(\'autoresize_bottom_margin\', 25) + \'px\');
            });

            // Add appropriate listeners for resizing content area
            ed.onChange.add(resize);
            ed.onSetContent.add(resize);
            ed.onPaste.add(resize);
            ed.onKeyUp.add(resize);
            ed.onPostRender.add(resize);

            if (ed.getParam(\'autoresize_on_init\', true)) {
            //  ed.onLoad.add(resize);
                ed.onLoadContent.add(resize);
            }

            // Register the command so that it can be invoked by using tinyMCE.activeEditor.execCommand(\'mceExample\');
            ed.addCommand(\'mceAutoResize\', resize);
        },

        /**
         * Returns information about the plugin as a name/value array.
         * The current keys are longname, author, authorurl, infourl and version.
         *
         * @return {Object} Name/value array containing information about the plugin.
         */
        getInfo : function() {
            return {
                longname : \'Auto Resize\',
                author : \'Moxiecode Systems AB\',
                authorurl : \'http://tinymce.moxiecode.com\',
                infourl : \'http://wiki.moxiecode.com/index.php/TinyMCE:Plugins/autoresize\',
                version : tinymce.majorVersion + "." + tinymce.minorVersion
            };
        }
    });

    // Register plugin
    tinymce.PluginManager.add(\'autoresize\', tinymce.plugins.AutoResizePlugin);
})();