Pure JS implementation based on the CSS class selection dom

This article mainly introduces the pure JS implementation according to the CSS class selection dom, the need for friends can refer to the

On-line reference, I modified part//code as follows, pure JS, request browser support Getelementsbyclassname method code as follows: <script type= "Text/javascript" > function g  Etelementsbyclassname (Classname,node) {node = node | | | window.document;  if (node.getelementsbyclassname) {return node.getelementsbyclassname (classname);  }else{var results = new Array ();  var elems = Node.getelementsbytag ("*"); for (Var i=0;i<elems.length;i++) {if (Elems[i].classname.indexof (className)!=-1) {results[elems.length] = Elems[i]  ;  } return results;  }  }; </script>