Use cases of jQuery :lt(index) selector-JS Tutorial-php.cn

Use cases of jQuery :lt(index) selector

黄舟

Release： 2017-06-23 10:40:25

Original

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The example in this article describes the usage of the :lt selector in jQuery. Share it with everyone for your reference. The specific analysis is as follows:

This selector matches all elements that are less than the given index value.
The minimum index value starts from 0.

Grammar structure:

$(":lt(index)")

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This selector is generally used in conjunction with other selectors, such as Class selector and Element selector, etc. wait.
For example:

$("li:lt(3)").css("color","blue")

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The above code can set the font color in the li element with an index less than 3 to blue.
If not used with other selectors, the default state is to be used with the * selector, for example, $(":lt") is equivalent to $("*:lt").

Parameter list:

Parameter Description

index The given index value.

Example code:

Example 1:













  html专区
  div+css专区
  jQuery专区
  Javascript专区

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The above code can set the font color of the li elements in the li element collection with an index value less than 3 to blue.

Example 2:

<!DOCTYPE html>
<html>
<head>
<meta charset=" utf-8">
<meta name="author" content="http://www.jb51.net/" />
<title></title>
<script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script>
<script type="text/javascript"> 
$(document).ready(function(){ 
  $("#btn").click(function(){ 
    $("*").each(function(){ 
      alert(this.tagName); 
    })         
  }) 
  $("#show").click(function(){ 
    $(":lt(11)").css("border","1px solid red"); 
  }) 
}); 
</script>
</head>
<body>
<ul>
  <li>html专区</li>
  <li>div+css专区</li>
  <li>jQuery专区</li>
  <li>Javascript专区</li>
</ul>
<button id="btn">遍历所有元素</button>
<button id="show">点击查看选择器效果</button>
</body>
</html>

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Since the above code does not specify a selector to be used with the :lt selector, it is used with the * selector by default, so the above code can change the current The border color of all elements in the document with an index value less than 11 is set to red.

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