You create a Web page that contains drop-down menus that are defined by using div tags in the following code. You need to write a JavaScript function that will enable the drop-down menus to activate when the user positions the mouse over the menu title. Which code segment should you use?() ["$(".dropdown-menu").hover( function () { $(".menu-items").slideDown(100); },function () { $(".menu-items").slideUp(100); } );","$(".dropdown-menu").hover( function () { $(".menu-items", this).slideDown(100); },function (){ $(".menu-items", this).slideUp(100); } );","$(".dropdown-menu").hover( function () { $(this)".slideDown(100); }, function () { $(this).slideUp(100); } );","$(".dropdown-menu").hover( function () { $("this.menu-title",).slideDown(100); },function () {$("this.menu-title",).slideUp(100); } );"]
简述海运提单的性质和作用。
简述人际关系出现障碍的原因。
下列哪一项不是安全目标管理所具有的主要特点?() ["目的性","分权性","民主性","垄断性"]
You work as an application developer at Certkiller .com. You would like to create a custom performance counter for an application that you created recently. To do this, you decide to create a custom category named ApplicationPerformance and a performance counter named HitNumber.You need to ensure that this counter is shared across numerous applications. What should you do?() ["A","B","C","D"]
何谓水轮机能量转换的最优工况?