<script type="text/javascript"> 
 // Close HTML Tags -------------------------------------------- 
  function closeHTML(str){ 
 var arrTags=["span","font","b","u","i","h1","h2","h3","h4","h5","h6","p","li","ul","table","div"]; 

 for(var i=0;i<arrTags.length;i++){ 
 var intOpen=0; 
 var intClose=0; 

 var  re=new RegExp("\\<"+arrTags[i]+"( [^\\<\\>]+|)\\>","ig"); 
 var arrMatch=str.match(re); 
 if(arrMatch!=null) intOpen=arrMatch.length; 

 re=new RegExp("\\<\\/"+arrTags[i]+"\\>","ig"); 
 arrMatch=str.match(re); 
 if(arrMatch!=null) intClose=arrMatch.length; 

 for(var j=0;j<intOpen-intClose;j++){ 
 str+="</"+arrTags[i]+">"; 
 } 
 /*for(var j=(intOpen-intClose-1);j>=0;j--){ 
 str+="</"+arrTags[i]+">"; 
 }*/ 
 } 

 return str; 
 } 

 // Close UBB Tags -------------------------------------------- 
 function closeUBB(str){ 
 var arrTags=["code","quote","list","color","align","font","size","b"]; 

 for(var i=0;i<arrTags.length;i++){ 
 var intOpen=0; 
 var intClose=0; 

 var  re=new RegExp("\\["+arrTags[i]+"(=[^\\[\\]]+|)\\]","ig"); 
 var arrMatch=str.match(re); 
 if(arrMatch!=null) intOpen=arrMatch.length; 

 re=new RegExp("\\[\\/"+arrTags[i]+"\\]","ig"); 
 arrMatch=str.match(re); 
 if(arrMatch!=null) intClose=arrMatch.length; 

 for(var j=0;j<intOpen-intClose;j++){ 
 str+="[/"+arrTags[i]+"]"; 
 } 
 } 

 return str; 
 } 

 alert(closeHTML("正常:<div class='testBox'><ul><li><b>加粗</b><span>字体哈哈")); 
 alert(closeHTML("有错:<div class='testBox'><p><ul><li><b>加粗</b><span>字体哈哈")); 
</script>