52장 History객체

<input id="Button1" type="button" value="2단계 뒤로" onclick="history.go(-2);" />
<input id="Button2" type="button" value="뒤로" onclick="history.go(-1);" />
<input id="Button3" type="button" value="새로고침" onclick="history.go(0);" />
<input id="Button4" type="button" value="앞으로" onclick="history.go(1);" />