js二级下拉导航菜单演示下载

javascript原生代码制作网页导航菜单，当鼠标悬浮上去切换对应的子级菜单，鼠标离开后，高亮显示初始选中菜单。

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导航菜单html代码

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//设置当前频道
var def = "1";

function mover(object) {

    //主菜单
    var mm = document.getElementById("m_" + object);
    mm.className = "m_li_a";

    //初始主菜单先隐藏效果
    if (def != 0) {
        var mdef = document.getElementById("m_" + def);
        mdef.className = "m_li";
    }

    //子菜单
    var ss = document.getElementById("s_" + object);
    ss.style.display = "block";

    //初始子菜单先隐藏效果
    if (def != 0) {
        var sdef = document.getElementById("s_" + def);
        sdef.style.display = "none";
    }

}

function mout(object) {

    //主菜单
    var mm = document.getElementById("m_" + object);
    mm.className = "m_li";

    //初始主菜单还原效果
    if (def != 0) {
        var mdef = document.getElementById("m_" + def);
        mdef.className = "m_li_a";
    }

    //子菜单
    var ss = document.getElementById("s_" + object);
    ss.style.display = "none";

    //初始子菜单还原效果
    if (def != 0) {
        var sdef = document.getElementById("s_" + def);
        sdef.style.display = "block";
    }
}