Consume WCF from HTML/JavaScript

[Mod: edited to mask password]
(1)    I created a WCF web service and deploy it to IIS. 
    public class Service1 : IService1
    {
        public String GetData(string iv)
        {
            string rv = "";
            SqlConnection conn =
                new SqlConnection("Data Source=xxxxx04;"
                + "Initial Catalog=Incidents;"
                + "User ID=ts__B;"
   &n ...