对参数进行序列化

$http({ 
   method: "POST", 
   url: "http://192.168.2.2:8080/setId", 
   data: {cellphoneId: "b373fed6be325f7"}, 
   headers: { 'Content-Type': 'application/x-www-form-urlencoded' }, 
   transformRequest: function(obj) { 
   var str = []; 
   for (var s in obj) { 
   str.push(encodeURIComponent(s) + "=" + encodeURIComponent(obj[s])); 
   } 
   return str.join("&"); 
  } 
 }).success();