salesforce apex + vf page 实现JSON

public with sharing class YUT_jsondata {

public String jsonString {get; set;}

public YUT_jsondata(){
jsonString = parseJson();
}

public String parseJson(){

String soql = 'SELECT FirstName, LastName, PersonEmail, Id, Route__c, Technical_Title__pc FROM Account where Name != null';
List<Account> acct = Database.Query(soql);
return JSON.serialize(acct);

}

}

<apex:page controller="YUT_jsondata"  contentType="application/x-JavaScript; charset=utf-8"
showHeader="false" standardStylesheets="false" sidebar="false">
{!jsonString}
</apex:page>