angular form Multipart/form-data 上传图片

$scope.save = function() {    
        var fd = new FormData();
        var file = document.querySelector('input[type=file]').files[0];
        fd.append('logo', file); 
         $http({
              method:'POST',
              url:"your url",
              data: fd,
              headers: {'Content-Type':undefined},
              transformRequest: angular.identity 
               })   
              .success( function ( response )
                       {
                       //上传成功的操作
                       alert("uplaod success");
                       }); 

     }
    });