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JQuery选择器1

2016-05-19 10:23 525 查看 
check
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>check dome</title>
<style>
div{
color: red;
}
</style>
<script src="jquery-2.2.3.min.js"></script>

</head>
<body>
<form>
<p>
<input  type="checkbox" name="newspaper" value="Hourly" checked="checked">Hourly
<input  type="checkbox" name="newspaper" value="Daily" >Daily
<input  type="checkbox" name="newspaper" value="Weekly" >Weekly
<input  type="checkbox" name="newspaper" value="Monthly" >Monthly
<input  type="checkbox" name="newspaper" value="Yearly" >Yearly
</p>
</form>
<div>
</div>
<script>
//        var count = function () {
//            var n =  $("input:checked").length;
//            $("div").text(n+(n==1?"is":"are")+"checked");
//        }
//        count();
//        $("input[type=checkbox]").on("click",count);//on 绑定事件

//        var count = function () {
//            var n = $("input:checked").length;
//            $("div").text(n+(n==1?"is":"are")+"checked");
//        }
//        count();
//        $("input[type=checkbox]").on("click",count);

var count = function () {
var n = $("input:checked").length;
$("div").text(n+(n==1?"is":"are")+"checked");
}
count();
$("input[type=checkbox]").on("click",count);

</script>
</body>
</html>


child selector

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>child demo</title>
<style>
body{
font-size: 14px;
}
</style>
<script src="jquery-2.2.3.min.js"></script>
</head>
<body>
<ul class="nav">
<li>
Item 1
</li>
<li>
Item 2
<ul class="navv">
<li>Nested item 1</li>
<li>Nested item 2</li>
<li>Nested item 3</li>
</ul>
</li>
<li>
Item 3
</li>
</ul>

<script>
$("ul.nav > li").css("border","3px double red");
$("ul.navv > li").text("fasjfhafhaw");
</script>
</body>
</html>
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