jQuery：调用后更改插件选项

HTML：

<div id="popup">I'm a popup</div>

JS：

(function ($) {
    $.fn.dialogPlugin = function (options,val) {

        var
            // setter function close
            fnClose = null,// function when close
            fnMyClose = function() {
                alert("This is plugin's close behavior");
                if (fnClosE)
                    fnClose();
            };

        if (options == "option") {
            if (name == "close" && $.isFunction(val)) {
                fnClose = val;
                val = fnMyClose;
            }
        } 
        else {
            if (options.closE)
                fnClose = options.close;

            options.close = fnMyClose;
        }

        return (Name)
            ? $(this).dialog(options,val) //if var == 'undefined'is equal to not send parameters
            : $(this).dialog(options);
    };

})(jQuery);


$("#popup").dialogPlugin({
    close: function() {
        alert("This is user's first close behavior");
    }
});


$("#popup").dialogPlugin("option",function() {
    alert("This is user's second close behavior");
});

编辑

或更简单优雅：

(function($){

    var dialog_close = $.ui.dialog.prototype.close;

    $.ui.dialog.prototype.close = function() {

        var self = this;

        alert("This is plugin's close behavior");

        dialog_close.apply(this,arguments);


    };

})(jQuery);