window.onload = function () {
var lis = document.getElementsByTagName("li");
var pics = document.getElementsByClassName("pic");
for (var i=0; i<lis.length; i++){
(function (i) {
lis[i].onmouseover = function(){
pics.style.visibility = "visible";
}
})(i);
}
}
为什么不能修改 style不能这么用?