javascript - Problem with ajax not being able to obtain data?

Question

$(oFind).bind('click',function(){
        var oKeyword = $('.locating').val();
        if( oKeyword != '' ){
            $.ajax({
                type:"post",
                async:true,
                url: "{:U('Reply/index')}",
                data:{keyword:oKeyword},
                success:function(){
                    $(oZs).fadeOut("fast");
                    $(oCx).fadeIn("fast");
                }
            });
        }
    });

oFind is a button. After binding a click event to it, send an ajax request to the background and check the console that everything is normal. There are no errors in the parameters and URL.

<?php
namespace Home\Controller;
use Think\Controller;

class ReplyController extends CommonController {
    public function index(){
        if($_POST){
            
            echo "ddd";

        }
　
    　}
}

But it just can’t print out ddd? Can you help me find out what’s wrong?

Answer 1

Sister, you don’t have a console, how can you print? success:function(){

            $(oZs).fadeOut("fast");
            $(oCx).fadeIn("fast");
        }  改成  success:function(data){
            console.log(data);
            $(oZs).fadeOut("fast");
            $(oCx).fadeIn("fast");
        }

Answer 2

Ajax is not used like this. You pass the value, but if you echo something in the index, it cannot be seen on the other side.
You set up a success callback and receive data processing here.
I prefer json For transmission, if you use json, you can echo json_encode your data in the controller

Answer 3

This is embarrassing. Isn’t the returned data a return? ? ? ? ? ? ? ? ? ? Forgive my ignorance