jquery ajax 无刷新上传

var form = new FormData();

form.append('file', $("#submitmaterials").find("input")[1].files[0]);

$.ajax({

	url: server_url + "scbg/doscbg?ajid" + current_case.ajid + "&accessToken=" + accessToken,

	type: 'POST',

	cache: false,

	data: form,

	processData: false,

	contentType: false,

	success: function (data) {

		if (data == 'error') {

		}

	}

});