我正在研究 Ruby on Rails 教程第 8 章中的示例，并且在我的页面上出现上述错误，并且我的下拉菜单不起作用。关于如何解决这个问题的任何想法？
/* ===================================================
* bootstrap-transition.js v2.0.0
* http://twitter.github.com/bootstrap/javascript.html#transitions
* ===================================================
* Copyright 2012 Twitter, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ========================================================== */
!function( $ ) {
$(function () {
"use strict"
/* CSS TRANSITION SUPPORT (https://gist.github.com/373874)
* ======================================================= */
$.support.transition = (function () {
var thisBody = document.body || document.documentElement
, thisStyle = thisBody.style
, support = thisStyle.transition !== undefined || thisStyle.WebkitTransition !== undefined || thisStyle.MozTransition !== undefined || thisStyle.MsTransition !== undefined || thisStyle.OTransition !== undefined
return support && {
end: (function () {
var transitionEnd = "TransitionEnd"
if ( $.browser.webkit ) {
Uncaught TypeError: Cannot read property 'webkit' of undefined
transitionEnd = "webkitTransitionEnd"
} else if ( $.browser.mozilla ) {
transitionEnd = "transitionend"
} else if ( $.browser.opera ) {
transitionEnd = "oTransitionEnd"
}
return transitionEnd
}())
}
})()
})
}(window.jQuery);