title: How to find out all nested child node of a parent nod?
body: <p>I have this JSTree </p>
  
  <p><img src="https://i.stack.imgur.com/Gjasi.png" alt="enter image description here"></p>
  
  <p>and following code for this tree</p>
  
  <pre><code>var data1 = [{
    "id": "W",
    "text": "World",
    "state": { "opened": true },
    "children": [{"text": "Asia"}, 
                 {"text": "Africa"}, 
                 {"text": "Europe",
                  "state": { "opened": false },
                  "children": [ "France","Germany","UK" ]
    }]
  }];
  
  $('#data').jstree({ 
      core: {
        data: data1, 
        check_callback: false
      }, 
      checkbox: {       
  
        whole_node : false,
        tie_selection : false 
      },
      plugins: ['checkbox','search']
  })
  </code></pre>
  
  <p>What I want is to get all the nested or deep child node of a parent node . How can I do this ?</p>