JQuery插件的两种写法

(function (jQuery){
this.show = function(title){
this.title=title;
};
this.show2 = function(){
alert(this.title);
};
jQuery.messager = this;
return jQuery;
})(jQuery);

<script src="jquery.js"></script>
<script src="js.js"></script>
<script>
$(document).ready(function(){
$("#d").messager().hide();
});
</script>