var _formData = new FormData(_this.get()[0]);
var _postData = {
url: _this.prop("action"),
method: "POST",
data: _formData,
processData: false,
contentType: false,
};

$.ajax(_postData)
.done(
function (_ret) {
}
)
.fail(
function (_ret) {
console.log("fail");
console.log(_ret);
}
)
;


参考:http://chaika.hatenablog.com/entry/2014/04/12/001012