<!DOCTYPE html>
<html>
<head lang="en"><meta charset="UTF-8"><title>标题</title><style>div {width: 200px;height: 200px;background-color: red;display: none;}</style>
</head>
<body><input type="button" value="显示" id="show"/><input type="button" value="隐藏" id="hide"/><input type="button" value="切换" id="toggle"/> <br/><br/><div id="div1"></div>
</body>
</html><script src="jquery-1.12.4.js"></script>
<script>
$(function(){$('#show').click(function(){$('#div1').show(400)})$('#hide').click(function(){$('#div1').hide(400)})$('#toggle').click(function(){$('#div1').toggle(400)})})
</script>
 函数的理解)
