editormd.amd.js
function(callback) {
            var settings = this.settings;
            
            if(settings.readOnly) {
                return this;
            }
            
            if (settings.toolbar && (this.toolbar.length < 1 || this.toolbar.find("." + this.classPrefix + "menu").html() === "") )
            {
                this.setToolbar();
            }
            
            settings.toolbar = true; 
            
            this.toolbar.show();
            this.resize();
            
            $.proxy(callback || function(){}, this)();

            return this;
        }
function(callback) {
            var settings = this.settings;
            
            if(settings.readOnly) {
                return this;
            }
            
            if (settings.toolbar && (this.toolbar.length < 1 || this.toolbar.find("." + this.classPrefix + "menu").html() === "") )
            {
                this.setToolbar();
            }
            
            settings.toolbar = true; 
            
            this.toolbar.show();
            this.resize();
            
            $.proxy(callback || function(){}, this)();

            return this;
        }
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@param   {Function} [callback=function(){}] 回调函数
@returns {editormd}  返回editormd的实例对象