getElementsByClassName的兼容性

/*----------------------------index.html------------------------------------*/

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="Author" content="Hehe">
  <title>Shopping list</title>
  <link rel="stylesheet" type="text/css" href="my_css.css">
</head>
  <body>
   <h1>What to buy</h1>
   <p title="a gentle reminder">Don't forgrt to buy this stuff.</p>
   <ul id="purchases">
    <li>A tin of beans</li>
    <li class="sale">Cheese</li>
    <li class="sale important">Milk</li>
   </ul>
   <script type="text/javascript" src="my_script.js"></script>
  </body>
</html>

/*------------------------my_script.js------------------------*/

function getElementsByClassName(node,classname){
  if(node.getElementsByClassName){
      return node.getElementsByClassName(classname);
  }
  else{
        var results=new Array();
        var elems=node.getElementsByTagName("*");
         for(var i=0;i<elems.length;i++){
                if(elems[i].className.indexOf(classname)!=-1){
                       results[results.length]=elems[i];
                           }
                   }
               return results;
         }
 }

var shopping=document.getElementById("purchases")
  var itsems=getElementsByClassName(shopping,"sale");
          for(var i=0;i<itsems.length;i++){
               alert(typeof itsems[i]);
}

此时页面显示俩个object的警告框。

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