javascript - Getting an error even when checkbox is checked -

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From all instances, I have found that is used (': check') to The correct checkbox is checked, and if it is not wrong in my case, it lies on both situations, what is my fault? 

  {xtype: 'checkbox', box label: 'show message', id: 'main box', handler: function () {alert ($ (this) .is (': check That ')); According to}  , I will try:  

  {xtype: 'checkbox', box label: 'show message', id: 'main box', handler: function (field, value) {warning (value); }}

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