代码分割线====================================
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<style type="text/css">
</style>
</head>
<body>
<label style="display:none" id="label">test</label><br>
<input type="button" value="show" id="btn_show"/>
<input type="button" value="hide" id="btn_hide"/>
<script type="text/javascript">
var btn = document.getElementById('btn');
btn_show.onclick = function() {
document.getElementById('label').style.display="block";
};
btn_hide.onclick = function() {
document.getElementById('label').style.display="none";
};
</script>
</body>
</html>
1.visibility 对应hidden和visible占用空间
2.display 对应block和none,不占用空间