ajax同步与异步

<pre name="code" class="javascript">

	function initRole(){
		var types=type.getValue();
		if (types != null && types != ''){
			url1=“url路径”;
			paramValue='checked = true ';
			return	getData(url1,paramValue);
			
		}	
	}

function getData(url,paramValue){ 
	var code=""; 
	var name="";
	 Ext.Ajax.request({ url:url,method:'POST',async:false,params:{'_queryCondition':paramValue},success:function(form,action){ 
			var datas = Ext.util.JSON.decode(form.responseText);
			 if(datas.length>0){ 
				code = datas[0].code; name = datas[0].name; 
				} } });
			 return code + "," + name; }