<!DOCTYPE html>
<html >
<head>
<meta charset="UTF-8">
<title></title>
<style>
div {
width: 300px;
height: 300px;
background-color: pink;
}
.cls {
display: none;
}
</style>
</head>
<body>
<input type="button" value="隐藏" />
<div ></div>
<script src="common.js"></script>
<script>
//点击按钮通过类样式的方式显示和隐藏div
my$("bt").onclick = function () {
//判断div使用应用了类样式
if (my$("dv").className != "cls") {
//现在是显示的,点击隐藏
my$("dv").className = "cls";
my$("bt").value = "显示";
} else {
//现在是隐藏的,点击显示
my$("dv").className = "";
my$("bt").value = "隐藏";
}
};
</script>
</body>
</html>