jquery selector

jquery的选择器功能

1 :lt(index) selector

一组元素选择index之前的元素，若index<0 则倒着选过来

http://api.jquery.com/lt-selector/

<!doctype html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>lt demo</title>

  <script src="//code.jquery.com/jquery-1.10.2.js"></script>

</head>

<body>

<table border="1">

  <tr><td>TD #0</td><td>TD #1</td><td>TD #2</td></tr>

  <tr><td>TD #3</td><td>TD #4</td><td>TD #5</td></tr>

  <tr><td>TD #6</td><td>TD #7</td><td>TD #8</td></tr>

</table>

<script>

$( "td:lt(4)" ).css( "backgroundColor", "yellow" );

$( "td:lt(-2)" ).css( "color", "red" );

</script>

</body>

</html>

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