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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

              <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>
              <a href="" target="_blank" class="btn btn-default" role="button" title="Get a random Wiki article"><span class="glyphicon glyphicon-random"></span></a> 
  <div class="row">
    <div class="col-md-4 col-md-offset-4 content">
      <ul class="list-group" id="results">       
              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;


//        url = ""+q+"&format=json&callback=?";

    //You have a form, which means you have to prevent the form from submitting
    var q = $('#query').val(),
        url = ""+q+"&format=json&origin=*";  // For Wikipedia API you don't need jsonp ,replace callback=? with origin=* and just use regular json
      type: 'GET',
      url: url,
      async: false,
      success: function(data){
        for (i=0; i<data[1].length; i++){
          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){