显示：display:none;
隐藏：display:block;
方法一：设置display样式
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<input type="button" value="隐藏" id="btn"/>
<div id="box"><img src="1.jpg" alt=""></div>
<script>
var btn = document.getElementById("btn");
btn.onclick = function () {
var box=document.getElementById("box");
if(this.value=="隐藏"){
box.style.display="none";
this.value="显示";
} else if(this.value=="显示"){
box.style.display="block";
this.value="隐藏";
}
}
</script>
</body>
</html>方法二：通过类样式设置元素的显示和隐藏
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.dv{
display:none;
}
</style>
</head>
<body>
<input type="button" value="隐藏" id="btn"/>
<div id="box"><img src="1.jpg" alt=""></div>
<script>
var btn = document.getElementById("btn");
btn.onclick = function () {
var box=document.getElementById("box");
if(box.className != "dv"){
box.className = "dv";
this.value="显示";
} else if(box.className = "dv"){
box.className = "";
this.value="隐藏";
}
}
</script>
</body>
</html>