鼠标悬浮显示二级菜单效果的jquery实现

当鼠标悬浮时显示二级菜单，这种类似的效果，想必大家在浏览网页时经常会遇到吧，下面有个示例，大家可以看看

1.布局：

<div> <img src="https://www.jb51.net/~/images/head_icon.png" /> <div> <ul> <li> <a href='#'> <span>修改密码</span> </a> </li> <li> <a href='#' ><span>退出</span></a> </li> </ul> </div> </div>

2.js控制：

function dropMenu(obj) { $(obj).each(function () { var theSpan = $(this); var theMenu = theSpan.find(".drop"); var tarHeight = theMenu.height(); theMenu.css({ height: 0, opacity: 0 }); var t1; function expand() { clearTimeout(t1); //theSpan.find('a').addClass("selected"); theMenu.stop().show().animate({ height: tarHeight, opacity: 1 }, 200); } function collapse() { clearTimeout(t1); t1 = setTimeout(function () { // theSpan.find('a').removeClass("selected"); theMenu.stop().animate({ height: 0, opacity: 0 }, 200, function () { $(this).css({ display: "none" }); }); }, 250); } theSpan.hover(expand, collapse); theMenu.hover(expand, collapse); }); }

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