angularjs封装$http为factory的方法

app.factory('dataFactory', function ($http, $q){ 
  var factory = {}; 
  factory.getlist = function(endpoint, method, headers, params) { 
    var defer = $q.defer(); 
    if (method == 'GET') { 
      $http({ 
        url: endpoint, 
        method: "GET", 
        headers: headers, 
        params: params, 
      }).suess(function (data) { 
        defer.resolve(data); 
      }). 
      error(function (data, status, headers, config) { 
        // defer.resolve(data); 
        defer.reject(data); 
      }); 
    } else { 
      $http({ 
        url: endpoint, 
        method: method, 
        headers: headers, 
        data: params, 
      }).suess(function (data) { 
        defer.resolve(data); 
      }). 
      error(function (data, status, headers, config) { 
        // defer.resolve(data); 
        defer.reject(data); 
      }); 
    } 
    return defer.promise; 
    }; 
    return factory; 
}); 

headers = {'Content-Type': 'application/json'};

dataFactory.getlist("/api/checkDuplicate", 'GET', headers, params).then(function(data) { 
//suess函数 
},function(data){ 
//error函数 
}) 

 headers = {'Content-Type': 'application/x--form-urlencoded;charset=utf-8'}；

var param = function(obj) { 
        var query = '', name, value, fullSubName, subName, subValue, innerObj, i; 
 
        for(name in obj) { 
         value = obj[name]; 
 
         if(value instanceof Array) { 
          for(i=0; i<value.length; ++i) { 
           subValue = value[i]; 
           fullSubName = name + '[' + i + ']'; 
           innerObj = {}; 
           innerObj[fullSubName] = subValue; 
           query += param(innerObj) + '&'; 
          } 
         } 
         else if(value instanceof Object) { 
          for(subName in value) { 
           subValue = value[subName]; 
           fullSubName = name + '[' + subName + ']'; 
           innerObj = {}; 
           innerObj[fullSubName] = subValue; 
           query += param(innerObj) + '&'; 
          } 
         } 
         else if(value !== undefined && value !== null) 
          query += encodeURIComponent(name) + '=' + encodeURIComponent(value) + '&'; 
        } 
        return query.length ? query.substr(0, query.length - 1) : query; 
        }; 
      $http({ 
        url: endpoint, 
        method: method, 
        headers: headers, 
        data: param(params), 
      }).suess(function (data) { 
        defer.resolve(data); 
      }). 
      error(function (data, status, headers, config) { 
        // defer.resolve(data); 
        defer.reject(data); 
      });