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WCF web.config配置：

<?xml version="1.0"?>
<configuration>

  <system.web>
    <compilation debug="true" targetFramework="4.0" />
  </system.web>
  <system.serviceModel>
    <bindings>
      <basicHttpBinding>
        <binding name="" closeTimeout="00:30:00" openTimeout="00:30:00"
          receiveTimeout="00:30:00" sendTimeout="00:30:00" maxBufferSize="2147483647"
          maxBufferPoolSize="2147483647" maxReceivedMessageSize="2147483647">
          <readerQuotas maxDepth="32" maxStringContentLength="2147483647"
            maxArrayLength="2147483647" maxBytesPerRead="4096" maxNameTableCharCount="16384" />
          <!--below config is for https-->
          <!--<security mode="Transport">
            <transport clientCredentialType="None" />
          </security>-->
        </binding>
      </basicHttpBinding>
    </bindings>
    <services>
      <service name="WcfHost.Service2">
        <endpoint address="Ajax" behaviorConfiguration="AjaxBehavior"
          binding="webHttpBinding" contract="WcfHost.Service2" />
        <endpoint address="Siverlight"
          binding="basicHttpBinding" contract="WcfHost.Service2" />        
      </service>
    </services>
    <behaviors>
      <endpointBehaviors>
        <behavior name="AjaxBehavior">
          <enableWebScript />
        </behavior>
      </endpointBehaviors>
      <serviceBehaviors>
        <behavior name="">
          <serviceMetadata httpGetEnabled="true" />
          <serviceDebug includeExceptionDetailInFaults="true" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true"
      multipleSiteBindingsEnabled="true" />
  </system.serviceModel>
 <system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>
  </system.webServer>
  
</configuration>

在JQuery使用：

<script type="text/javascript">
  var Type;
  var Url;
  var Data;
  var ContentType;
  var DataType;
  var ProcessData;

  function WCFJSON() {
    Type = "POST";
    Url = "/WcfHost/Service2.svc/Ajax/GetTest";
    ContentType = "application/json; charset=utf-8";
    DataType = "json";
    ProcessData = true;
    CallService();
  }

  function CallService() {
    $.ajax({
      type: Type, //GET or POST or PUT or DELETE verb
      url: Url, 
      data: Data, 
      contentType: ContentType,
      dataType: DataType, 
      processdata: ProcessData,
      success: function (msg) {
        ServiceSucceeded(msg);
      },
      error: ServiceFailed
    });
  }

  function ServiceFailed(xhr) {
    alert('Service call failed: ' + xhr.status + '' + xhr.statusText);
    Type = null;
    varUrl = null;
    Data = null;
    ContentType = null;
    DataType = null;
    ProcessData = null;
  }

  function ServiceSucceeded(result) {
    if (DataType == "json") {
      alert(result.d);
    }
  }

  $(document).ready(
    function () {
      WCFJSON();
    }
);
</script>

WCF文件

namespace WcfHost
{
  [ServiceContract(Namespace = "")]
  [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
  public class Service2
  {
    [OperationContract]
    public void DoWork()
    {
      // Add your operation implementation here
      return;
    }
    // Add more operations here and mark them with [OperationContract]
    [OperationContract]
    public string GetTest()
    {
      return "Test";
    }
  }
}