Ajax get back value method in the background

This article is mainly to share with you Ajax to obtain back-end return value method, I hope to help everyone.

$.ajax ({       type: "POST",     URL: "http://localhost/.....php",     dataType: ' json ',     async:true,  // The default is true for asynchronous transfers, false for synchronous transmissions

Data: {"shopid": ID, "Mem_number": Mem_number, "member_id": member_id},

Success:function (msg) {//alert ("Participate successfully! "); Alert (msg); Window.location.reload ();//Reload the current page},//Ajax is executed asynchronously, the data has not returned to execute the following code, so success and error can not accurately get a one-to-one return value// Finally, only Object Object Error:function (msg) {//str = json.stringify (msg);//alert (str);//Console.log (msg);//alert (msg); /Window.location.reload ();//reload Current page}, Complete:function (msg) {///return data according to the results of the corresponding processing, whether the request succeeds or fails, will go this way, So ignore succes and error var str = msg.responsetext;//will return the result to a string, at this time, with the background of the tag "#" (own definition, mainly to intercept the string used) Main//alert (str); The IF (Str.indexof ("#") >0) {//indexof () method returns the position of the first occurrence of a specified string value in the string, or alert ("background query succeeded")}else{alert ("The background query failed, please retry later ");

  }                          }                      ); Ajax directly with. Ajax ({                        type:                        URL:                        dataType:                        async:                        data{"Subscript 1": value1, "Subscript 2": value2, "Subscript 3": Value3},})

You can do it.

If you need to return a value in the background without success without error

Use complete, because the return value regardless of success failed to go this way

Ajax directly with. Ajax ({                        type: ""                        URL: ""                        dataType: '                        async:                        data{"Subscript 1": value1, "Subscript 2": value2, "Subscript 3": VALUE3},                                                    complete:function (msg) {                        var str = msg.responsetext;                         if (Str.indexof ("#") >0) {                                alert ("Return to Background Success")                           }else{                                alert ("Back to Background Failure")}}                        )

Background code

echo "123456123";

Returned back to the background failed because no # appears

echo "123456#123";

Returned back to the background successfully because there are # occurrences