<div class="starts">
  <ul id="pingStar">
    <li rel="1" title="特別差，給1分"></li>
    <li rel="2" title="很差，給2分"></li>
    <li rel="3" title="一般般，給3分"></li>
    <li rel="4" title="很好，給4分"></li>
    <li rel="5" title="非常好，給5分"></li>
    <span id="dir"></span>
  </ul>
  <input type="hidden" value="" id="startP">
</div>

.starts,.starts ul{float:left;}
.starts{padding-left:16px;padding-top:7px;}
.starts ul li{width:32px;height:31px;float:left;background:#ddd;padding-right:3px;}
.starts ul li.on{background:red;}
.starts ul span{display:inline;float:left;padding-left:10px;height:31px;line-height:31px;}

window.onload = function () {
  var s = document.getElementById("pingStar"),
    m = document.getElementById('dir'),
    n = s.getElementsByTagName("li"),
    input = document.getElementById('startP'); //保存所選值
  clearAll = function () {
    for (var i = 0; i < n.length; i++) {
      n[i].className = '';
    }
  }
  for (var i = 0; i < n.length; i++) {
    n[i].onclick = function () {
      var q = this.getAttribute("rel");
      clearAll();
      input.value = q;
      for (var i = 0; i < q; i++) {
        n[i].className = 'on';
      }
      m.innerHTML = this.getAttribute("title");
    }
    n[i].onmouseover = function () {
      var q = this.getAttribute("rel");
      clearAll();
      for (var i = 0; i < q; i++) {
        n[i].className = 'on';
      }
    }
    n[i].onmouseout = function () {
      clearAll();
      for (var i = 0; i < input.value; i++) {
        n[i].className = 'on';
      }
    }
  }
}