一些时候告诉我们的用户该怎样做，特别是填写一些复杂的表格时。

/* jQuery autohelp Copyright Dylan Verheul
<
  This e-mail address is being protected from spambots. You need JavaScript enabled to view it
  /> * Licensed like jQuery, see http://docs.jquery.com/License
 */

$.fn.autohelp = function(t, o) {
	t = $(t); o = o || {};
	var h;
	this.focus(function() { h = t.html(); (o.hide ? t.show() : t).html(this.title); })
	    .blur(function() { (o.hide ? t.hide() : t).html(h); });
	return this;
}

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