jq的each和map遍历
<html>
<head>
<script src="//libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("li").each(function(){
alert($(this).text())
});
});
});
</script>
</head>
<body>
<button>Alert the value of each list item</button>
<ul>
<li>Coffee</li>
<li>Milk</li>
<li>Soda</li>
</ul>
</body>
</html>
<form method="post" action="">
<fieldset>
<div>
<label for="two">2</label>
<input type="checkbox" value="2" id="two" name="number[]">
</div>
<div>
<label for="four">4</label>
<input type="checkbox" value="4" id="four" name="number[]">
</div>
<div>
<label for="six">6</label>
<input type="checkbox" value="6" id="six" name="number[]">
</div>
<div>
<label for="eight">8</label>
<input type="checkbox" value="8" id="eight" name="number[]">
</div>
</fieldset>
</form>
$(':checkbox').map(function() {
return this.id;
}).get().join(',');
》》》："two,four,six,eight"。
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