title: ant design blur method for InputNumber component
body: <p>I wanna use blur method to run a function if InputNumber component lost focus, but I don't know how to use it.</p>
  
  <pre><code>&lt;InputNumber
  value={value}
  onChange={this.handleChange}
  onKeyDown={this.onKeyHandler}
  size="small"
  min={0}
  step={0.5}
  /&gt;
  </code></pre>