:input Selector
input selector
version added: 1.0jQuery(':input')
描述： 选择所有 input, textarea, select 和 button 元素.
:input选择器基本上选择所有表单控件。
Example:
Finds all input elements.
<!DOCTYPE html>
<html>
<head>
<style>
textarea { height:25px; }
</style>
<script src="http://code.jquery.com/jquery-latest.min.js"></script>
</head>
<body>
<form>
<input type="button" value="Input Button"/>
<input type="checkbox" />
<input type="file" />
<input type="hidden" />
<input type="image" />
<input type="password" />
<input type="radio" />
<input type="reset" />
<input type="submit" />
<input type="text" />
<select><option>Option</option></select>
<textarea></textarea>
<button>Button</button>
</form>
<div id="messages">
</div>
<script>
var allInputs = $(":input");
var formChildren = $("form > *");
$("#messages").text("Found " + allInputs.length + " inputs and the form has " +
formChildren.length + " children.");
// so it won't submit
$("form").submit(function () { return false; });
</script>
</body>
</html>