bootstrap的导航改造

在使用bootstrap制作后台时用到了响应式导航条，其中dropdown组件更是用的比较多，用的多需要点击的就多，dropdown默认鼠标左键单击才展开，如果使用鼠标放上去（hover）就展开则会省去点击时间，这样能提高效率。

原本的改造思路是：给dropdown元素绑定hover事件，hover上去的时候，执行该元素的click事件——即把hover同步为click，hover即为click。

但想到与其自己来改造，不如先在网上搜索搜索看看有没有现成的插件，果不其然就搜索到了，托管在github上的代码网址：查看

在这儿就直接把代码复制出来：

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/*  * Project: Twitter Bootstrap Hover Dropdown  * Author: Cameron Spear  * Contributors: Mattia Larentis  *  * Dependencies?: Twitter Bootstrap's Dropdown plugin  *  * A simple plugin to enable twitter bootstrap dropdowns to active on hover and provide a nice user experience.  *  * No license, do what you want. I'd love credit or a shoutout, though.  *  * http://cameronspear.com/blog/twitter-bootstrap-dropdown-on-hover-plugin/  */ ;(function($, window, undefined) {     // outside the scope of the jQuery plugin to     // keep track of all dropdowns     var $allDropdowns = $();               // if instantlyCloseOthers is true, then it will instantly     // shut other nav items when a new one is hovered over     $.fn.dropdownHover = function(options) {                   // the element we really care about         // is the dropdown-toggle's parent         $allDropdowns = $allDropdowns.add(this.parent());                   return this.each(function() {             var $this = $(this).parent(),                 defaults = {                     delay: 500,                     instantlyCloseOthers: true                 },                 data = {                     delay: $(this).data('delay'),                     instantlyCloseOthers: $(this).data('close-others')                 },                 options = $.extend(true, {}, defaults, options, data),                 timeout;                       $this.hover(function() {                 if(options.instantlyCloseOthers === true)                     $allDropdowns.removeClass('open');                           window.clearTimeout(timeout);                 $(this).addClass('open');             }, function() {                 timeout = window.setTimeout(function() {                     $this.removeClass('open');                 }, options.delay);             });         });     };               $('[data-hover="dropdown"]').dropdownHover(); })(jQuery, this);

可以看到作者在插件前面加了个分号;，增加了插件的兼容性，因为可能上一个js代码没写;，如果在此不加分号则可能因为没换行导致js出错。

插件支持HTML元素data-*传参，也支持初始化传参。将此js代码放在bootstrap原本的js代码后面执行即可。