js自动闭合html标签,自动补全html标记

假如我有一个DIV，若是没有闭合后面的样式都会乱了，这样的代码可能会影响后面的样式，我但愿用js去自动闭合这种没有闭合的标签:

代码以下：

<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; 
} 
</script>