<html><head><script>var lists=getByClass('meun');alert(lists.length);function getByClass(className){var nodes=document.getElementsByTagName('*');ret=[];for(var i;i<nodes.length;i++){if(hasClassName(nodes[i],className)) ret.push(nodes[i]);}return ret;}function hasName(node,className){var names=node.className.split(/\s+/);for(var i=0;i<names.length;i++){if(names[i]==className)return true;}}</script></head><body><div class="meun"></div></body></html>那里错了
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