1  module.exports = extend
 2  
 3  var hasOwnProperty = Object.prototype.hasOwnProperty;
 4  
 5  function extend(target) {
 6      for (var i = 1; i < arguments.length; i++) {
 7          var source = arguments[i]
 8  
 9          for (var key in source) {
10              if (hasOwnProperty.call(source, key)) {
11                  target[key] = source[key]
12              }
13          }
14      }
15  
16      return target
17  }