title: How to make vim AutoComplPop always highlight the first selection?
body: <p>I use the vim plugin AutoComplPop to auto complete my JavaScript code, here I meet a problem.</p>
  
  <p>When I want a completion, I have to press the ↓ button, it's troublesome.</p>
  
  <p>Can anyone tell me how to make the first selection highlighted, so that I don't have to press ↓ then press enter to complete my code.</p>
  
  <p>Also, is there a method that I can select the selection of completion without the ↓?</p>