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<div id="box1"></div>

<div class="box2"></div>
<div class="box2"></div>

<div id="box3">




                // getElementByIdにID名を指定して要素を取得
var e_div1 = document.getElementById( "box1" );
e_div1.innerHTML = "innerHTMLで文言追加";
e_div1.innerHTML += "<dl><dt>innerHTML</dt><dd>文言追加</dd></dl>";

// getElementsByClassNameにクラス名を指定して要素を取得
var e_div2 = document.getElementsByClassName( "box2" );

// 要素の最初に文言を追加
e_div2[0].innerHTML = "getElementsByClassNameを使って文言追加";

// ID名box3の直下にあるP要素を全て取得
var e_p = document.querySelectorAll( "#box3 > P" )
// 取得した要素の最後の要素に文言を追加する
e_p[e_p.length-1].innerHTML += 'querySelectorAllで文言追加';

// getElementByIdにID名を指定して要素を取得
var e_div10 = document.getElementById( "box10" );
// P要素を作成
var e_p = document.createElement( "p" );
// P要素に文字列を追加
e_p.innerHTML = "P要素を追加";
// box2に作成したP要素を追加
e_div10.appendChild( e_p );
// 結果をコンソールに出力
//console.log( e_div3 );