Jquery不显示JSONP数据

Question

$(document).ready(function () {
$( "#city" ).autocomplete({
 source: function( request, response ) {
       $.ajax({
        url: "ExternalURL/autocomplete.php",
      dataType: "jsonp",
      //data: {
       // featureClass: "P",
        //style: "full",
        //maxRows: 12,
        //name_startsWith: request.term
      //},
      success: function( data ) {
        response($.map( data, function(item ) {
          return {
            label: item.label ,
            value: item.value
          };
        }));
      }
    });
  },
  minLength: 1,
  select: function( event, ui ) {
    city( ui.item ?
      "Selected: " + ui.item.label :
      "Nothing selected, input was " + this.value);
  }
     });

}）;

我的网址提供如下数据

  

[{“label”：“PTP，Platinum Underwriters”，“value”：“PTP”}，{“label”：“RS，   Reliance Steel＆amp;铝“，”值“：”RS“}，{”标签“：”UNM，Unum   集团“，”价值“：”UNM“}，{”标签“：”ACH，铝业公司   中国“，”价值“：”ACH“}，{”label“：”CENX，Century   铝“，”值“：”CENX“}，{”label“：”KALU，Kaiser   铝”， “值”： “卡路”}]