01.code/LanweiUI/UEditor/_src/plugins/undo.js

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///import core
///commands 撤销和重做
///commandsName  Undo,Redo
///commandsTitle  撤销,重做
/**
* @description 回退
* @author zhanyi
*/

UE.plugins['undo'] = function() {
    var me = this,
        maxUndoCount = me.options.maxUndoCount || 20,
        maxInputCount = me.options.maxInputCount || 20,
        fillchar = new RegExp(domUtils.fillChar + '|<\/hr>','gi'),// ie会产生多余的</hr>
        //在比较时，需要过滤掉这些属性
        specialAttr = /\b(?:href|src|name)="[^"]*?"/gi;

    function UndoManager() {

        this.list = [];
        this.index = 0;
        this.hasUndo = false;
        this.hasRedo = false;
        this.undo = function() {

            if ( this.hasUndo ) {
                var currentScene = this.getScene(),
                    lastScene = this.list[this.index];
                if ( lastScene.content.replace(specialAttr,'') != currentScene.content.replace(specialAttr,'') ) {
                    this.save();
                }
                                    if(!this.list[this.index - 1] && this.list.length == 1){
                    this.reset();
                    return;
                }
                while ( this.list[this.index].content == this.list[this.index - 1].content ) {
                    this.index--;
                    if ( this.index == 0 ) {
                        return this.restore( 0 )
                    }
                }
                this.restore( --this.index );
            }
        };
        this.redo = function() {
            if ( this.hasRedo ) {
                while ( this.list[this.index].content == this.list[this.index + 1].content ) {
                    this.index++;
                    if ( this.index == this.list.length - 1 ) {
                        return this.restore( this.index )
                    }
                }
                this.restore( ++this.index );
            }
        };

        this.restore = function() {

            var scene = this.list[this.index];
            //trace:873