JavaScript实现星级评价效果

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>星级评价(可半星)</title>
 <style>
  .xin{height: 25px; background: url(images/x.png); position: relative; display: inline-block;}
  .xin span{display: block; height: 25px; background: #f60; position: absolute; left: 0; top: 0;z-index: -1;transition: 0.2s;}
  .xin ul{position: absolute; top: 0; left: 0; height: 25px; margin: 0; padding: 0; list-style: none;}
  .xin ul li{float: left; width: 18px; height: 25px;}
  .fensu{display: inline-block;}
 </style>
</head>
<body>
 <input type="hidden" title="10" value="3.5">
 <input type="hidden" title="5" value="1.5">
 <script>
  var input=document.querySelectorAll("input[type=hidden]");
  input.forEach(function(_input){
   var Div=document.createElement("div");
   Div.className="xin";
   Div.style.width=18*(_input.title || 5)*2 + "px";
   _input.parentNode.insertBefore(Div,_input);
   var span=document.createElement("span");
   span.style.width=(_input.value)*36+"px";
   var p=document.createElement("p");
   p.innerHTML=_input.value+"分";
   p.className="fensu";
   Div.parentNode.insertBefore(p,Div);
   Div.parentNode.insertBefore(Div,p);
   Div.appendChild(span);
   var ul=document.createElement("ul");
   Div.appendChild(ul);
   for(var i=0;i<(_input.title || 5)*2;i++){
    var li=document.createElement("li");
    li.title=(i+1)/2+"分";
    ul.appendChild(li);
   }
   var LI=ul.querySelectorAll("li");
   LI.forEach(function(_li,x){
    _li.onclick=function(){
     _input.value=(x+1)/2;
     span.style.width=18*(x+1)+"px";
     p.innerHTML=_input.value+"分";
    }
    _li.onmouseover=function(){
     span.style.width=18*(x+1)+"px";
    }
    _li.onmouseout=function(){
     span.style.width=(_input.value)*36+"px";
    }
   })
   var br=document.createElement("br");
   p.parentNode.insertBefore(br,p);
   p.parentNode.insertBefore(p,br);
  })
 </script>
</body>
</html>