我可以向当前的“ this”对象添加属性吗？ 怎么样？

Question

I am checking a this.hash property onClick of tab but onload hash doesn't exist, Can I add hash property onLoad to let this condition pass through? So self.$("first").ready(renderPage) is called onLoad and I am trying to add this.hash to it so it passes the condition in renderPage().

 render : function () {
        self = this;
        renderPage = function () {
                            console.log("this.hash : " + this.hash);

                            if (this.hash) { // this.hash is only present when tab is clicked onLoad its undefined
                               //do some stuff
                                getTabClicked(this.hash);
                            }
                            buildString();

                            ajaxData.callAPI(function (data) {
                             // process data and render output;
                            });
                     }
         onloadCall = function () {
                            $(self.el).html(self.template());
                            self.$(tab).html(self.templateFlyout());
                            self.$("#allTabs").tabs().addClass("xyz");
                            self.$("#first").tabs();
                            self.$("#second").tabs();
                            //this.hash = "first"; // but it gives error this is undefined.
                            self.$("first").ready(renderPage); // I want to add this.hash before this call
                            self.$("[id^=tabs-]").click(renderPage);
                            onMenuChange();
                        },

                        readJson = function () {
                            $.getJSON("./js/data/myJson.json", function (data) {
                                jsonData = data;
                                onloadCall();
                            });
                        };

            readJson();

            return this;
        }

Answer 1

Yes, easily.

this.newProperty = value;
// Or
this[newProperty] = value;

this is defined by the context of the current function. If you want to access the same definition of this outside the function it's used in, you have to know what that definition is. In your case, it looks like the definition is document , given that you say the context is [#Object HTMLDocument] . So, to add a hash property to that version of this is simple:

// instead of
this.hash = "first";
// use
document.hash = "first";