Several two-level linkage cases (Jquery\array\ajax PHP) _jquery

In the development process, encountered a very many two-level linkage, the following is my summary of several two-level linkage cases

Two-stage linkage (1)
The first case is a relatively simple two-level linkage, using the display of jquery hidden to achieve, for less data of the two-level linkage can be adopted

<! DOCTYPE html>  

Two-level linkage (2)-array
The second case is to use two-dimensional arrays to pass data, using JavaScript

Two-level linkage (3)-Ajax
  The third case is using AJAX

<! DOCTYPE html>  

Two-level linkage (3-1)-ajax/php 
The third case is to use Ajax to get data from PHP

<! DOCTYPE html>  

Php:

<?php
 //For processing client request two-level linkage data
 //1. Receive the province information sent by the client
 $province = $_post[' provcince '];
 2. Determine current province information, provide different city information
 switch ($province) {case
 ' Shandong Province ':
 Echo ' Qingdao, Jinan, Weihai, Rizhao, Dezhou ';
 break;
 Case ' Liaoning Province ':
 Echo ' Shenyang, Dalian, Tieling, Dandong, Jinzhou ';
 break;
 Case ' Jilin Province ':
 Echo ' Changchun, Songyuan, Jilin, Tonghua, Siping ';
 break;

 The server-side response is a string

?> 

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