mysql - Destroy problem about backbone+php

I implemented the deletion of data in PHP by rewriting the destroy() of backbone sync to correspond to PHP (clicking the delete button will trigger the delete event), but because the URL is defined in the collection, when rewriting the URL of destroy, Unable to perform the corresponding operation, please answer!

<code>//Collection
App.Users=Backbone.Collection.extend({
  model : App.User,
  url : function(){
    return '/crud2/save.php';
  },
  initialize : function(){
    this.on('add',function(){
      console.log(this.length);
    });
    this.on('remove',function(){
      console.log(this.length);
    });
  }
});</code>

<code>  `delete : function(){
  //this.model.url='delete.php';
  //console.log(this.model.url);
  $('#Name').val("");
  $('#Phone').val("");
  this.model.destroy({
    url : 'delete.php',
    type : 'POST',
    success : function(){
      console.log('success');
    },
    error : function(){
      console.log('error');
    }
  }
  ); 
}`

</code>

<code>//delete.php
<?php
    date_default_timezone_set('prc');
    error_reporting(E_ALL ^ E_DEPRECATED);
    header("Content-type : application/json; charset = utf-8");  
    $connection=mysql_connect("localhost","root","123456");
    if(!$connection){
        die('connect failed!');
    }else{
        mysql_select_db("backbone");
        mysql_query("set names utf-8");
        $data = json_decode(file_get_contents("php://input"));
        //echo $data;
        file_put_contents("data.txt", $data->username);
        $sql = "delete from user where username == '$data->username'";
        mysql_query($sql);
?></code>

Reply content:

I implemented the deletion of data in PHP by rewriting the destroy() of backbone sync to correspond to PHP (clicking the delete button will trigger the delete event), but because the URL is defined in the collection, when rewriting the URL of destroy, Unable to perform the corresponding operation, please answer!

<code>//Collection
App.Users=Backbone.Collection.extend({
  model : App.User,
  url : function(){
    return '/crud2/save.php';
  },
  initialize : function(){
    this.on('add',function(){
      console.log(this.length);
    });
    this.on('remove',function(){
      console.log(this.length);
    });
  }
});</code>

<code>  `delete : function(){
  //this.model.url='delete.php';
  //console.log(this.model.url);
  $('#Name').val("");
  $('#Phone').val("");
  this.model.destroy({
    url : 'delete.php',
    type : 'POST',
    success : function(){
      console.log('success');
    },
    error : function(){
      console.log('error');
    }
  }
  ); 
}`

</code>

<code>//delete.php
<?php
    date_default_timezone_set('prc');
    error_reporting(E_ALL ^ E_DEPRECATED);
    header("Content-type : application/json; charset = utf-8");  
    $connection=mysql_connect("localhost","root","123456");
    if(!$connection){
        die('connect failed!');
    }else{
        mysql_select_db("backbone");
        mysql_query("set names utf-8");
        $data = json_decode(file_get_contents("php://input"));
        //echo $data;
        file_put_contents("data.txt", $data->username);
        $sql = "delete from user where username == '$data->username'";
        mysql_query($sql);
?></code>