过滤特殊字符的js代码

<script language="javascript">
function checkforms()
{
   var iu, iuu, regarray=new array("◎","■","●","№","↑","→","↓"+
   "!","@","#","$","%","^","&","*","(",")","_","-","+","=","|","","[","]","？","~","`"+
   "!","<",">","‰","→","←","↑","↓","¤","§","＃","＆","＆","＼","≡","≠"+
   "≈","∈","∪","∏","∑","∧","∨","⊥","‖","‖","∠","⊙","≌","≌","√","∝","∞","∮"+
   "∫","≯","≮","＞","≥","≤","≠","±","＋","÷","×","/","ⅱ","ⅰ","ⅲ","ⅳ","ⅴ","ⅵ","ⅶ","ⅷ","ⅹ","ⅻ","一","二"+
   "╄","╅","╇","┻","┻","┇","┭","┷","┦","┣","┝","┤","┷","┷","┹","╉","╇","【","】"+
   "三","四","五","六","七","八","九","十","①","②","③","④","⑤","⑥","⑦","⑧","⑨","⑩","┌","├","┬","┼","┍","┕","┗","┏","┅","—"+
   "〖","〗","←","〓","☆","§","□","‰","◇","＾","＠","△","▲","＃","℃","※",".","≈","￠");
   iuu=regarray.length;
   var obj=document.getelementbyid("username");
   if(obj.value=="")
   {
     alert("用户名不能为空");
      obj.focus();
      return false;
   }
   for(iu=1;iu<=iuu;iu++)
   { 
      if(regarray[iu] !="")
       {
          if (obj.value.indexof(regarray[iu])!=-1)
           {
             alert("注册名不可以包含：" + regarray[iu]);
             document.gforms.username.focus();
             return false;
          }
        }
   }
   return true;            
}
</script>
<form method="post" onsubmit="return checkforms();">
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
请输入用户名:<input type="text" name="username">
<input type="submit" name="submit" value="提交">
</form>