this.menuObj[i].onmouseover = function(){
this.className='nav_over';
}
this.menuObj[i].onmouseOut = function(){
this.className='nav_out';
}
this不能闭包
this.className='nav_over';
}
this.menuObj[i].onmouseOut = function(){
this.className='nav_out';
}
this不能闭包
所以他没menuObj[i]