求解釋下面這段JS代碼的意思,我是剛接觸JS的.
//初始化
var def="1";
function mover(object){
//主菜單
var mm=document.getElementById("m_"+object);
mm.className="m_li_a";
//初始主菜單隱藏效果
if(def!=0){
var mdef=document.getElementById("m_"+def);
mdef.className="m_li";
}
//子菜單
var ss=document.getElementById("s_"+object);
ss.style.display="block";
//初始子菜單隱藏效果
if(def!=0){
var sdef=document.getElementById("s_"+def);
sdef.style.display="none";
}
}
function mout(object){
//主菜單
var mm=document.getElementById("m_"+object);
mm.className="m_li";
//初始主菜單
if(def!=0){
var mdef=document.getElementById("m_"+def);
mdef.className="m_li_a";
}
//子菜單
var ss=document.getElementById("s_"+object);
ss.style.display="none";
//初始子菜單
if(def!=0){
var sdef=document.getElementById("s_"+def);
sdef.style.display="block";
}
}