ajax表單提交 同步上傳文件

var form = new FormData(document.getElementById("friendshipCooperationFrom"));

$.ajax({
url:"<%=basePath%>${action }",
type:"post",
data:form,
processData:false,
contentType:false,
success:function(data){
alert(data);
},
error:function(e){
alert("错误！！");
}
});

new FormData();