var container = document.getElementById('virtual-keyboard');
var VirtualKeyboard = tui.VirtualKeyboard; // or require('tui-virtual-keyboard');
var instance = new VirtualKeyboard(container, {
     keyType: 'number',
     keys: ['9', '3', '5', '1', '', '7', '0', '2', '4', '6', '8', ''],
     functions: {
         shuffle: 0,
         language: 2,
         caps: 3,
         symbol: 4,
         remove: 5,
         clear: 9,
         space: 10,
         close: 11,
         done: 20
     },
     template: {
         key: '<li class="subcon"><span class="btn_key"><button type="button">{KEY}</button></span></li>',
         blank: '<li class="subcon"><span class="btn_key"></span></li>',
         shuffle: '<li class="subcon"><span class="btn btn_reload"><button type="button" value="shuffle">재배열</button></span></li>',
         remove: '<li class="subcon last"><span class="btn btn_del"><button type="button" value="remove"><span class="sp">삭제</span></button></span></li>'
     },
     callback: {
         key: function() {
         },
         getKeys: function() {
         },
         remove: function() {
         }
     },
     isClickOnly: false
});