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HTML

              
                <div class="container-fluid">
  <div class="row">
    <div class="col-md-4 col-md-offset-4 text-center">
      <h1>Wikipedia Viewer</h1>
      <form class="form-inline">
        <div class="form-group">
          <div class="input"> <!-- input-group 元素之间没有间隙 -->
            <input type="text" class="form-control" placeholder="Press Enter to Search" id="query">   <!-- form-control 使得搜索框和其他的一样大小 -->
            <span class="buttons">
              <button class="btn btn-default" type="submit" id="search">
                <span class="glyphicon glyphicon-search"></span>
              </button>
              <a href="https://en.wikipedia.org/wiki/Special:Random" target="_blank" class="btn btn-default" role="button" title="Get a random Wiki article"><span class="glyphicon glyphicon-random"></span></a> 
            </span>
          </div>
        </div>
      </form>
     </div>
  </div>
  
  <div class="row">
    <div class="col-md-4 col-md-offset-4 content">
      <ul class="list-group" id="results">       
      </ul>
    </div>
  </div>
</div>
              
            
!

CSS

              
                body {
background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAkAAAAJCAYAAADgkQYQAAAAG0lEQVQYV2PcvHnzf19fX0YGPACvJEzfqCIGAC55BAqBlVXsAAAAAElFTkSuQmCC) repeat;
}

.container-fluid {
  margin-top: 40px;
}

.input {
  margin-top: 20px;
}

.content {
  margin-top: 20px;
}

.list-group-item {
  margin-bottom: 20px;
  border-style: dotted;
  border-width: 1px;
  background: #F0F0F0;
}

.list-group-item a {
  font-size: 1.2em;
}
              
            
!

JS

              
                //https://en.wikipedia.org/w/api.php?action=help&modules=query%2Bextracts

// https://en.wikipedia.org//w/api.php?action=opensearch&format=json&search=rainbow 

//        url = "https://en.wikipedia.org/w/api.php?action=opensearch&search="+q+"&format=json&callback=?";



$(document).ready(function(){
  $('#search').click(function(event){
    event.preventDefault();
    //You have a form, which means you have to prevent the form from submitting
    var q = $('#query').val(),
        url = "https://en.wikipedia.org/w/api.php?action=opensearch&search="+q+"&format=json&origin=*";  // For Wikipedia API you don't need jsonp ,replace callback=? with origin=* and just use regular json
    console.log(q);
    $.ajax({
      type: 'GET',
      url: url,
      async: false,
      dataType:'json',
      success: function(data){
        console.log(data);
        $('#results').html('');
        for (i=0; i<data[1].length; i++){
          console.log(data[1]);
          var  heading = data[1];
          var  summary = data[2];
          var  pageLink = data[3];
          $("#results").append("<li class='list-group-item'><a href="+pageLink[i]+" target='_blank'>"+heading[i]+"</a><p>"+summary[i]+"</p></li>");
        }
      },
      error: function(error){
        alert('Error');
      }
    });
    
  });
});

              
            
!
999px

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