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console 命令行工具 X clear 

                    

                        
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console

            
$('#container').jstree({
  "core" : {
    "check_callback" : true
  },
  "plugins" : ["unique", "dnd"]
});

            
<div id="container">
  <ul>
    <li data-jstree='{"opened":true, "type":"demo"}'>Root node
      <ul>
        <li>b</li>
        <li>a</li>
      </ul>
    </li>
    <li data-jstree='{"opened":true, "type":"demo"}'>Root node
      <ul>
        <li>b</li>
        <li>a</li>
      </ul>
    </li>
  </ul>
</div>

            

                
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