ajax同时调用两个方法,两个$.ajax如何同时执行

最近在做一个asp.net实时进度条遇到的问题

function importExcel() {

if (!checkForm()) {

return false;

}

$.ajax({

url: "/API/BackProcess.ashx",

type: "POST",

dataType: "json",

data: {

action: "ImportExcel",

excelFilePath:$("#ctl00_contentHolder_fpExcel").val(),

cusType: $("#ddlCusType").val(),

relateID: $("#ddlRelation").val(),

state: $("#ddlStatu").val(),

fromUserID: $("#ctl00_contentHolder_hmSelect_hfUserID").val(),

},

success: function (info) {

if (info.success) {

}

else {

ShowMsg(info.ErrMsg, false);

}

},

error: function (XMLHttpRequest, textStatus, errorThrown) {

closeBg();

ShowMsg("错误信息：" + errorThrown, false);

}

});

setTimeout(getProgress(),20);

}

function getProgress() {

alert("bbbbb");

$.ajax({

url: "/API/BackProcess.ashx",

type: "POST",

data: { action: "GetProgress" },

success: function (width) {

if (width != "-1") {

//工作没有结束，继续查询进度

//setTimeout(getProgress(), 20);

$("#progressbar").css("width", width + "%");

$("#progressbar").text(width + "%");

} else {

//工作完成

$("#progressbar").css("width", "100%");

$("#progressbar").text("100%");

}

}

});