FF mouseleave/mouseenter events

Question

我向FF寫入擴展名，這部分代碼在早期版本6.0-8.0上不起作用。 但在12.0-13.0版本中，一切都很好。是什麼原因？

 for(var i = 0; i < doc.getElementsByClassName('repInfo').length; i++) 
     { 
      doc.getElementsByClassName('repInfo')[i].getElementsByTagName('a')[0].style.visibility = "hidden"; 
      doc.getElementsByClassName('repInfo')[i].getElementsByTagName('a')[1].style.visibility = "hidden"; 

      doc.getElementsByClassName('repInfo')[i].addEventListener('mouseleave', 
       function(e) { 
        e.target.getElementsByTagName('a')[0].style.visibility = "hidden"; 
        e.target.getElementsByTagName('a')[1].style.visibility = "hidden"; 
       }, false); 
      doc.getElementsByClassName('repInfo')[i].addEventListener('mouseenter', 
       function(e) { 
        e.target.getElementsByTagName('a')[0].style.visibility = "visible"; 
        e.target.getElementsByTagName('a')[1].style.visibility = "visible"; 
       }, false); 
     } 

Answer 1

mouseenter和mouseleave載體用火狐加入10