【jQuery进阶】子菜单插件Slight Submenu

插件特点：

        非常容易使用，只有几KB大小，完全控制每一个环节

        几乎没有CSS

        多级嵌套的子菜单，每个嵌套本身（完全控制，再次）

        内联CSS选项允许css来进行内联

        自定义场景,深层嵌套（松散，结构甚至凹凸不平，没有双关语意）

        兼容所有浏览器（记住，jQuery的2 *及以上不支持<IE9，如果您使用的是，对于那些旧的浏览器不支持）

插件选项和用法：

要使用你需要> = 1.8的jQuery和插件本身的插件：

<script src="http://code.jquery.com/jquery-1.8.0.min.js"></script>
<script src="js/jquery.slight-submenu.min.js"></script>

如果你不使用内联CSS（插件选项），有一些强制性的CSS，你可能想要从包括或复制的内容：

<link rel="stylesheet" href="css/slight-submenu.css" />

之后，你可以简单地套用插件元素

$('selector').slightSubmenu(options);

选项：

您可以修改每一个选项

$('#master-menu').slightSubmenu({
    buttonActivateEvents: 'click mouseenter',   // Space separated events string (just as you would use in a plain jQuery .on('events-string', ...) ) that activate the expand/collapse buttons
    buttonCloseNotSubmenuEvents: 'mouseenter',  // the events that should collapse a submenu are the same as the ones that open it - this option lets you specify those that should not be able to close it
    multipleSubmenusOpenedAllowed: true,    // pretty straighforward - if set to false, only a single submenu at a time can stay expanded
    prependButtons: false,  // this is where to put the buttons inside the parent LI - in the beginning (true) or just before the submenu UL (false)
    applyInlineCss: false,  // more control with javascript
    topUlClass: 'slight-submenu-master-ul', // class for the top most ul, holding the LIs with submenu ULs
    topLiClass: '', // class for the top UL LIs
    topLiWithUlClass: 'li-with-ul', // class for the LIs that hold an UL
    buttonClass: 'slight-submenu-button',   // class for the expand/collapse buttons
    buttonSubmenuOpenedClass: 'opened', // class for the button when its corresponding submenu is visible
    submenuUlClass: 'slight-submenu-ul',    // class for the
    directLiInlineCss: $.fn.slightSubmenu.defDirectLiInlineCss, // *InlineCss options hold js objects with css definitions (those options correspond to the elements we can attach classes to)
    submenuUlInlineCss: $.fn.slightSubmenu.defSubmenuUlInlineCss,
    topContainerInlineCss: $.fn.slightSubmenu.defTopContainerInlineCss,
    buttonInlineCss: $.fn.slightSubmenu.defButtonInlineCss,
    buttonActiveInlineCss: $.fn.slightSubmenu.defButtonActiveInlineCss,
    // callbacks that control the way the currently processed submenu is managed
    handlerButtonIn: $.fn.slightSubmenu.handlerButtonIn,    // receives a jQuery object (the $submenuUl) as an argument; makes the menu visible
    handlerForceClose: $.fn.slightSubmenu.handlerForceClose // receives a jQuery object (the $submenuUl) as an argument; hides the menu
    handlerGenerateButtonMarkup: $.fn.slightSubmenu.handlerGenerateButtonMarkup // allows for custom submenu button markup
});

引用$.fn.slightSubmenu.* objects/functions看起来像这样：

$.fn.slightSubmenu.handlerButtonIn = function($submenuUl) {
    $submenuUl.show(1000);
};
$.fn.slightSubmenu.handlerForceClose = function($submenuUl) {
    $submenuUl.hide(1000);
};
// the passed argument, by default is settings.buttonClass
$.fn.slightSubmenu.handlerGenerateButtonMarkup = function(buttonClass) {
    return '<span class="' + buttonClass + '"></span>';
};
$.fn.slightSubmenu.defTopContainerInlineCss = { position: 'relative' };
$.fn.slightSubmenu.defDirectLiInlineCss = {};
$.fn.slightSubmenu.defSubmenuUlInlineCss = {};
$.fn.slightSubmenu.defButtonActiveInlineCss = {};
$.fn.slightSubmenu.defButtonInlineCss = {
    background: '#ccc',
    display: 'inline',
    marginLeft: '8px',
    width: '10px',
    height: '18px',
    position: 'absolute',
    cursor: 'pointer'   // this might be the difference
                        // between the 'click' working on iOS and not
};

没有测试，请大家测试使用！