<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>星级评价</title> <style type="text/css"> .star{padding: 0; margin:0;} .star em{ width: 27px; height: 27px; background: url(star.gif) no-repeat top left;float:left;} .star em.color{ background: url(star.gif) no-repeat bottom left; } .star span{padding-left: 5px; line-height: 30px;} </style> </head> <body> <div id="star" class="star"> <em mytitle="很差"></em> <em mytitle="差"></em> <em mytitle="中"></em> <em mytitle="好"></em> <em mytitle="很好"></em> <span></span> </div> </body> </html> <script> var oDiv=document.getElementById("star"); var aEm=oDiv.getElementsByTagName("em"); var result=oDiv.getElementsByTagName("span")[0]; for (var i = 0; i < aEm.length; i++) { aEm[i].index=i; aEm[i].onmouseover=function(){ for (var i = 0; i < aEm.length; i++) { if(i<=this.index){ aEm[i].className="color" }else{ aEm[i].className="" } } result.innerHTML=this.getAttribute("mytitle"); } }; </script>
原文：http://www.cnblogs.com/busicu/p/4210583.html