// APPLY TO STANDARD DROPDOWN ELEMENTS
// ===================================
$(document)
.on('click.bs.dropdown.data-api', clearMenus)
.on('click.bs.dropdown.data-api', '.dropdown form', function (e) { e.stopPropagation() })
.on('click.bs.dropdown.data-api' , toggle, Dropdown.prototype.toggle)
.on('keydown.bs.dropdown.data-api', toggle + ', [role=menu]' , Dropdown.prototype.keydown)

$(document).ready(function(){
$(document).off('click.bs.dropdown.data-api');
});

$(document).ready(function(){
dropdownOpen();//调用
});
/**
* 鼠标划过就展开子菜单，免得需要点击才能展开
*/
function dropdownOpen() {
var $dropdownLi = $('li.dropdown');
$dropdownLi.mouseover(function() {
$(this).addClass('open');
}).mouseout(function() {
$(this).removeClass('open');
});
}