jQuery插件的开发

jQuery插件的开发包括两种：

一种是类级别的插件开发，即给jQuery添加新的全局函数，相当于给jQuery类本身添加方法。jQuery的全局函数就是属于jQuery命名空间的函数；另一种是对象级别的插件开发，即给jQuery对象添加方法。

本文提供的jQuery插件开发框架综合上述两种方式，代码如下所示：

// AMD support
(function(factory) {
    //"use strict";
    if (typeof define === 'function' && define.amd) {
        // using AMD; register as anon module
        define(['jquery'], factory);
    } else {
        // no AMD; invoke directly
        factory((typeof (jQuery) != 'undefined') ? jQuery : window.Zepto);
    }
}
(function($) {
    "use strict";
    var pluginNS = 'InputBox',
    pluginPfx = 'IP',
    /* 
    ----------------------------------------
    VARS, CONSTANTS
    ----------------------------------------
    */
    totalInstances = 0, /* plugin instances amount */
    /* 
    ----------------------------------------
    DEFAULT OPTIONS 默认参数
    ----------------------------------------
    */
    defaults = {        
        nParam: 0       
    },
    /* 
    ----------------------------------------
    METHODS 公有函数
    ----------------------------------------
    */
    methods = {
        init: function(options) {
            var opts = $.extend(true, {}, defaults, options);
            /* plugin constructor */
            return $(this).each(function() {
                $this = $(this);
                if (!$this.data(pluginPfx)) { /* prevent multiple instantiations */
                    /* store options and create objects in jquery data */
                    $this.data(pluginPfx, {
                        idx: ++totalInstances, /* instance index */
                        opt: opts /* options */
                    });
　　　　　　　　　　var d = $this.data(pluginPfx), o = d.opt;
                }
            });
        },
        destroy:function(){            
        
        }
    },
    /*
    ----------------------------------------
    FUNCTIONS 私有函数
    ----------------------------------------
    */
    _default = function(opts) {        
    };
    /* 
    ----------------------------------------
    PLUGIN SETUP 
    ----------------------------------------
    */
    /* plugin constructor functions */
    
    /* usage: $(selector).pluginNS(); 对象级别*/
    $.fn[pluginNS] = function(method) {
        if (methods[method]) {
            return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));
        } else if (typeof method === "object" || !method) {
            return methods.init.apply(this, arguments);
        } else {
            $.error("Method " + method + " does not exist!");
        }
    };
    /* usage: $.pluginNS(); 类级别*/
    $[pluginNS] = function(method) {
        if (methods[method]) {
            return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));
        } else if (typeof method === "object" || !method) {
            return methods.init.apply(this, arguments);
        } else {
            $.error("Method " + method + " does not exist!");
        }
    };
    /* 
    allow setting plugin default options. 
    usage: $.pluginNS.defaults.nParam=5; 
    to apply any changed default options on default selectors (below), use inside document ready fn     
    */
    $[pluginNS].defaults = defaults;
}));

上述代码参考开源项目jQuery.mCustomScrollbar插件的整理。

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