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HTML 

              
                <h1>jQueryとjavascriptの比較 - 要素編</h1>

<div class="block">
  <h2>要素の取得</h2>
 
    <h3>親要素の取得</h3>
    <p>jQuery</p>
    <div class="word_block">
      <p>子要素からみて親要素の背景が赤くなるクラスの追加</p>

      <div class="jq_wrap">
        <p id="jq_child">子要素</p>
      </div>
    </div>

    <p>javascript</p>
    <div class="word_block">
      <div class="js_wrap">
        <p id="js_child">ボタン</p>
      </div>
    </div>

</div>

<div class="block">
 
    <h3>子要素の取得</h3>
    <p>jQuery</p>
    <div class="word_block">
      <p>ボーダーの親要をクリックすると子要素であれテキストの背景が赤くなる</p>

      <div id="jq_parent" class="jq_wrap">
        <p>子要素のテキスト</p>
      </div>
    </div>

    <p>javascript</p>
    <div class="word_block">
      <div id="js_parent" class="js_wrap">
        <p>子要素のテキスト</p>
      </div>
    </div>

</div>


<div class="block">
 
    <h3>兄弟要素（直前と直後）の取得</h3>
    <p>jQuery</p>
    <div class="word_block">
      <p>リストの2番目の要素の前後の要素が背景が赤くなるクラスを追加</p>

      <div class="jq_wrap">
        <ul>
          <li>1番目の要素</li>
          <li id="jq_list_second">2番目の要素</li>
          <li>3番目の要素</li>
        </ul>
      </div>
    </div>

    <p>javascript</p>
    <div class="word_block">
      <div class="js_wrap">
        <ul>
          <li>1番目の要素</li>
          <li id="js_list_second">2番目の要素</li>
          <li>3番目の要素</li>
        </ul>
      </div>
    </div>

</div>


<div class="block">
 
    <h3>最初と最後の子要素の取得</h3>
    <p>jQuery</p>
    <div class="word_block">
      <p>最初と最後の要素のみ背景を赤くする</p>

      <div id="jq_fl_wrap" class="jq_wrap">
        <p>これは最初の要素</p>
        <p>テキストテキスト</p>
        <p>これは最後の要素</p>
      </div>
    </div>

    <p>javascript</p>
    <div class="word_block">
      <div id="js_fl_wrap" class="js_wrap">
         <p>これは最初の要素</p>
        <p>テキストテキスト</p>
        <p>これは最後の要素</p>
      </div>
    </div>

</div>
<div class="block">
 
    <h3>子孫要素を検索して取得</h3>
    <p>jQuery</p>
    <div class="word_block">
      <p>親要素から特定のpタグとli要素を検索して背景を赤くなるクラスを追加する</p>

      <div id="jq_find_wrap" class="jq_wrap">
        <p>このテキストの背景は赤くしない</p>
        <ul>
          <li>リスト要素</li>
          <li>リスト要素</li>
        </ul>
        <p id="jq_txt">このテキストの背景を赤くする</p>
      </div>
    </div>

    <p>javascript</p>
    <div class="word_block">
      <div id="js_find_wrap" class="js_wrap">
        <p>このテキストの背景は赤くしない</p>
        <ul>
          <li>リスト要素</li>
          <li>リスト要素</li>
        </ul>
        <p id="js_txt">このテキストの背景を赤くする</p>
      </div>
    </div>

</div>
!

CSS 

              
                h1{
  font-size:18px;
  text-align:center;
  padding-bottom:1px solid #333;
  margin-bottom:30px;
}

p{
  font-size:14px;
}

h2{
  font-size:18px;
  text-align:center;
  padding-bottom:1px solid #333;
  margin-bottom:30px;
}

h3{
  font-size:16px;
  border-left:3px solid #ff0000;
  padding-left:10px;
}

.block{
  padding:20px;
  border-bottom:1px solid #ccc;
}

.jq_wrap,
.js_wrap{
  border:2px solid #ccc;
  padding:10px;
}

.addclass_red{
  background-color:#ff0000;
}
!

JS 

              
                // 親要素取得
var parent = $("#jq_child").parent();
parent.addClass("addclass_red");

//子要素取得
$("#jq_parent")
  .children()
  .addClass("addclass_red");

//隣接する用を取得
var next_dom = $("#jq_list_second").next();
next_dom.addClass("addclass_red");

var prev_dom = $("#jq_list_second").prev();
prev_dom.addClass("addclass_red");

//findで検索してクラスを追加する
$("#jq_find_wrap")
  .find("p#jq_txt,li")
  .addClass("addclass_red");

//最初と最後の要素を検索して背景を赤くする
$("#jq_fl_wrap p:first-child").addClass("addclass_red");
$("#jq_fl_wrap p:last-child").addClass("addclass_red");

// javascript
var jq_child = document.getElementById("js_child");
var js_parent = document.getElementById("js_parent");
var js_list_second = document.getElementById("js_list_second");
var js_find_wrap = document.getElementById("js_find_wrap");
var js_fl_wrap = document.getElementById("js_fl_wrap");

//親要素を取得
var parent = jq_child.parentNode;
parent.classList.add("addclass_red");

//子要素を取得
var child = js_parent.children;
child[0].classList.add("addclass_red");

//隣接する要素を取得

var next_dom = js_list_second.nextElementSibling;
next_dom.classList.add("addclass_red");

var prev_dom = js_list_second.previousElementSibling;
prev_dom.classList.add("addclass_red");

//最初と最後の要素を検索して赤くする
var first_child = js_fl_wrap.firstElementChild;
first_child.classList.add("addclass_red");

var last_child = js_fl_wrap.lastElementChild;
last_child.classList.add("addclass_red");

//findで検索して要素を赤くする
var find_dom = js_find_wrap.querySelectorAll("p#js_txt,li");
for (var i = 0; i <= find_dom.length; i++) {
  find_dom[i].classList.add("addclass_red");
}
!
999px

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