Question about jquery cross-origin call to the rest Service

Previously, jquery's Ajax request was used to access rest, and "Get/Post" was used to send HTTP requests. The server always received the "option" method. I learned on the Internet that cross-origin is actually the cause. The result is that neither HTTP header nor Params can be obtained.

Then, I checked the cross-origin call of jquery and found that jsonp can be used,CodeAs follows:

VaR Postdata = { ' Authorization ' : ' AWS cuimeng1: 1232432453 ' }
VaR Ddate = " Wed, 01 Mar 2009 12:00:00 GMT " ;
$. Ajax ({
URL: host_url,
Type: ' Get ' ,
Datatype: ' Jsonp ' ,
Jsonp: ' Callback ' ,
Data: postdata,
Header :{
" Authorization " : " AWS cuimeng1: 1232432453 "
},
Beforesend: function (xhr ){
Xhr. setRequestHeader ( " Date " , Ddate );
Xhr. setRequestHeader ( " Authorization " , " AWS cuimeng1: 1232432453 " );
},
Success: function (result ){
Alert ( ' OK ' );
},
Error: function (xhr, textstatus, errowthrown ){
Alert (xhr. status );
Alert (textstatus );
}
});