第一种

js:

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

<script src="jquery.js"></script>
<script src="js.js"></script>
<script>
$(document).ready(function(){
    $.messager.show("this is a test");
    $.messager.show2();
});
</script>

 

第二种

js:

Code
$.fn.messager =function(options){
var defaults = {
        title:"this is a test!"
    };
    $.extend(defaults,options);
    alert(defaults.title);
returnthis;
};

 

html:

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