Zetero assign Language between Chinese and English

zeteroZhEn.js

var fieldName = "language";
var en = "en";
var zh = "zh"

var getFieldID = function(item, fieldName) {
   var fieldID = Zotero.ItemFields.getID(fieldName);
   var mappedFieldID = Zotero.ItemFields.getFieldIDFromTypeAndBase(item.itemTypeID, fieldName);
   return mappedFieldID ? mappedFieldID : fieldID
}

var setLanguage= function(item, value) {
		item.setField(getFieldID(item, fieldName), value);
		item.save();
}
 
var s = new Zotero.Search;
s.addCondition('joinMode', 'all');
s.addCondition('noChildren', 'true')
s.addCondition(fieldName, 'isNot', en);
s.addCondition(fieldName, 'isNot', zh);
var ids = s.search();
var i = 0, j = 0;
if (ids) {
	for each(var id in ids) {
		var item = Zotero.Items.get(id),
                     zhRe = /[\u4E00-\u9FBF]/;
                     title = item.getField("title");
if (item.getType() == 14 || item.getType() == 1) continue;
                if (!zhRe.test(title)) {
                     //EJS_appendToConsole(item.getType());
                    setLanguage(item, en);
                } else {
setLanguage(item, zh);
                }

	}
	//alert(ids.length + " items updated");
EJS_appendToConsole(ids.length);
EJS_appendToConsole(i + j);
}
else {
	//alert("No items found");
}