Whenever you pass a string of HTML to any of jQuery's methods, this is what happens: A temporary element is created, let's call it x. x's ... ... <看更多>

jquery append example : The following example appends the specified HTML to all div elements <html&gt ... ... <看更多>

From the jQuery API docs for .load():. jQuery uses the browser's .innerHTML property to parse the retrieved. document and insert it into the current ... ... <看更多>

What they probably meant is that manipulating the DOM is slow and that you can avoid injecting HTML through jQuery. What you can do, instead, is to have A/B ... ... <看更多>