js字符串去重复id的实现代码

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]
我经常用的代码：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 
<title>js去除重复id</title> 
<script type="text/javascript"> 
function $Obj(objname){ 
return document.getElementById(objname); 
} 
//供使用者调用 
function trim(s){ 
return trimRight(trimLeft(s)); 
} 
//去掉左边的空白 
function trimLeft(s){ 
if(s == null) { 
return ""; 
} 
var whitespace = new String(" \t\n\r"); 
var str = new String(s); 
if (whitespace.indexOf(str.charAt(0)) != -1) { 
var j=0, i = str.length; 
while (j < i && whitespace.indexOf(str.charAt(j)) != -1){ 
j++; 
} 
str = str.substring(j, i); 
} 
return str; 
} 
//去掉右边的空白 
function trimRight(s){ 
if(s == null) return ""; 
var whitespace = new String(" \t\n\r"); 
var str = new String(s); 
if (whitespace.indexOf(str.charAt(str.length-1)) != -1){ 
var i = str.length - 1; 
while (i >= 0 && whitespace.indexOf(str.charAt(i)) != -1){ 
i--; 
} 
str = str.substring(0, i+1); 
} 
return str; 
} 
function doxgid() 
{ 
document.form1.likeid.value = trim(document.form1.likeid.value.replace(new RegExp('，',"gm"),',')); 
document.form1.likeid.value = trim(document.form1.likeid.value.replace(new RegExp(' ',"gm"),',')); 
xgidcheck(); 
} 
function xgidcheck(){ 
if(document.form1.likeid.value!=""){ 
var arr1 = unique(document.form1.likeid.value.split(",")); 
document.form1.likeid.value=arr1.join(","); 
} 
} 
//去重复数组 
function unique(data){ 
data = data || []; 
var a = {}; 
len = data.length; 
for (var i=0; i<len;i++){ 
var v = data[i]; 
if (typeof(a[v]) == 'undefined'){ 
a[v] = 1; 
} 
}; 
data.length=0; 
for (var i in a){ 
data[data.length] = i; 
} 
return data; 
} 
//专题增强 
function doxgid2(theitem) 
{ 
var theform=$Obj(theitem); 
theform.value = trim(theform.value.replace(new RegExp('，',"gm"),',')); 
theform.value = trim(theform.value.replace(new RegExp(' ',"gm"),',')); 
xgidcheck2(theform); 
} 
function xgidcheck2(theform){ 
if(theform.value!=""){ 
var arr1 = unique(theform.value.split(",")); 
theform.value=arr1.join(","); 
} 
} 
</script> 
</head> 
<body> 
<form name="form1"> 
实例一： 
单独的一个表单验证

实例二：多个表单验证

先将鼠标定位在表单里面，然后离开就可以触发了。 
onBlur 
</form> 
</body> 
</html>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]