var ul = document.getElementById('ul');var li = ul.getElementsByTagName('li');var arr = ['一月','二月','三月','四月','五月','六月'];for (var i = 0; i < li.length; i++) {li[i].index = i;li[i].onmouseover = function(){for (var i = 0; i < li.length; i++) {li[i].className = '';}this.className = 'ing';div1.innerHTML = '
'+ (this.index+1)+'yue' +'
' + '
'+ arr[this.index] + '
'}}
