jquery在线引用地址
(google提供)<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
(微软提供)<script src="https://ajax.microsoft.com/ajax/jquery/jquery-1.4.min.js"></script>
(google提供)<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
(微软提供)<script src="https://ajax.microsoft.com/ajax/jquery/jquery-1.4.min.js"></script>