通过点击按钮隐藏
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>a</title>
</head>
<body>
<form id="f">
<li>a1</li>
<li>a2</li>
<li>a3</li>
</form>
<button onclick="rep()">点击替换</button>
</body>
<script src="http://cdn.static.runoob.com/libs/jquery/1.10.2/jquery.min.js"></script>
<script type="text/javascript">
function rep(){
$("li:eq(1)").attr("hidden","hidden");
}
</script>
</html>通过加载页面自动隐藏
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>a</title>
</head>
<body>
<form id="f">
<li>a1</li>
<li>a2</li>
<li>a3</li>
</form>
<form id="d">
<li>b4</li>
<li>b5</li>
<li>b6</li>
</form>
<form id="e">
<div>c7</div>
<div>c8</div>
<div>c9</div>
</form>
<button>页面加载自动隐藏</button>
</body>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$("#f li:eq(1)").attr("hidden","hidden");
$("#d li:eq(2)").attr("hidden","hidden");
$("#e div:eq(0)").attr("hidden","hidden");
});
</script>
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