How to use JS to implement Base64 coding and MD5 encryption to complete express bird API interface call

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JS calls the API interface function GetAPI () {var key= "Express Bird API Key"; var id = "Express Bird Registration ID"; var requestData= "{'OrderCode':'','ShipperCode':'ZTO','LogisticCode':'78120038107849'}" / / MD5 encryption var md5str = md5 (requestData + key). ToLowerCase (); / / base64 var dataSign = Base64.encode (md5str); / / concatenate string (express bird request message format) url encoding var reqData = "RequestData=" + escape (requestData) + "& EBusinessID=" + id + "& RequestType=1002&DataSign=" + escape (dataSign) + "& DataType=2" / / reqData = "RequestData=%7b%27OrderCode%27%3a%27%27%2c%27ShipperCode%27%3a%27ZTO%27%2c%27LogisticCode%27%3a%2778120038107849%27%7d&EBusinessID=1264783&RequestType=1002&DataSign=NzMxNTAzZWYxYTJiOGIyMDhiNTVjMTc4MDQ0NjdlZDg%3d&DataType=2" / / trigger before calling SubmitPost ({method: 'post', url:' / api/dist', data: reqData, beforeSend: function (xhr) {/ /) Such as loading effect, success: function (data, status) {if (status) {document.getElementById ("msg") [xss_clean] = "" For (var I = 0, len = data.Traces.length; I < len; itemstation) {var acceptTime = data.Tracs [I] .AcceptTime; var acceptStation = data.Traces [I] .AcceptStation / / the display effect of the page is developed by itself. Here, only the function document.getElementById ("msg") [xss_clean] + = acceptTime + "" + acceptStation+ "" is implemented. }}, error: function (data, status, e) {if (data.status = = "401") {alert (data.status); return });}