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How to use jquery eq()
- 青灯夜游Original
- 2022-03-03 15:27:504189browse
In jquery, the eq() method is used to return the element with the specified index number of the selected element, the syntax "$(selector).eq(index)"; and ":eq()" select The operator is used to select elements with a specified index value, the syntax is "$(":eq(index)")".
The operating environment of this tutorial: windows7 system, jquery1.10.2 version, Dell G3 computer.
In jquery, eq() is divided into two situations:
eq() method
:eq() Selector
jquery eq() method
eq() method returns the specified index with the selected element number element. Index numbers start with 0, so the index number of the first element is 0 (not 1).
Syntax:
$(selector).eq(index)
index: Required. Specifies the index of the element, which can be an integer or a negative number. If a negative number is used, the index will be calculated from the end of the selected element.
Note: The index number starts from 0, so the index number of the first element is 0 (not 1).
Example 1: Select the second element (index number is 1)
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="js/jquery-1.10.2.min.js"></script>
<script>
$(document).ready(function() {
$("p").eq(1).css("background-color", "yellow");
});
</script>
</head>
<body>
<h1>欢迎来到我的主页</h1>
<p>我的名字叫Donald (下标 0).</p>
<p>Donald Duck (index 1).</p>
<p>我住在 Duckburg (index 2).</p>
<p>我最好的朋友是 Mickey (index 3).</p>
</body>
</html>
Example 2: Use a negative number to return the second element from the end of the selected element.
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="js/jquery-1.10.2.min.js"></script>
<script>
$(document).ready(function() {
$("p").eq(-2).css("background-color", "yellow");
});
</script>
</head>
<body>
<h1>欢迎来到我的主页</h1>
<p>我的名字叫 Donald。</p>
<p>Donald Duck。</p>
<p>我住在 Duckburg (将被选中，因为它是倒数第二个元素)。</p>
<p>我最好的朋友是 Mickey。</p>
</body>
</html>
jquery :eq() selector
:eq() selector Selects elements with the specified index value.
index values start from 0, so the index value of the first element is 0 (not 1).
The most common usage: Used with other selectors to select elements with a specified index in a specified combination.
Syntax:
$(":eq(index)")index: Required. Specifies the index of the element.
Example: Select the second element:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="js/jquery-1.10.2.min.js"></script>
<script>
$(document).ready(function() {
$("p:eq(1)").css("background-color","yellow");
});
</script>
</head>
<body>
<h1>欢迎来到我的主页</h1>
<p>我的名字叫 Donald。</p>
<p>Donald Duck。</p>
<p>我住在 Duckburg 。</p>
<p>我最好的朋友是 Mickey。</p>
</body>
</html>
[Recommended learning: jQuery video tutorial 、web front end】
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