表示または可視性による HTML 要素の非表示_HTML/Xhtml_Web ページの作成

HTML 要素の表示と非表示を制御します type="text/javascript ">
function showAndHidden1(){
var div1=document.getElementById("div2"); if(div1.style.display=='block') div1.style.display='none';
else div1.style.display='block';
if(div2.style.display==' block') div2.style .display='none';
else div2.style.display='block';
}
function showAndHidden2(){
var div3=document.getElementById(" div3");
var div4=document.getElementById("div4");
if(div3.style.visibility=='visible') div3.style.visibility='hidden';
else div3 .style.visibility='visible';
if(div4.style.visibility=='visible') div4.style.visibility='hidden';
else div4.style.visibility='visible'; 🎜>}