In jQuery: first selector usage example_jquery

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

This selector matches the first element in the specified collection of elements.

Grammar structure:

Copy code The code is as follows:

$(":first")

In use, it is generally used in conjunction with other selectors, such as class selectors, element selectors, etc. For example:

Copy code The code is as follows:

$("li:first").css("color","green" )

The above code can set the font color in the first li element in the li element collection to green.
If not used with other selectors, the default state is to be used with the * selector , for example, $(":first") is equivalent to $("*:first").

Example code:

Example 1:

Copy code The code is as follows:

• html area


• div css area


• jQuery Zone


• Javascript Zone

Click to see the effect

The above code can set the font color in the first li element in the li element collection to green.

Example 2:

Copy code The code is as follows:

• html area


• div css area


• jQuery Zone


• Javascript Zone

Script Home
The sun is out

Click to see the effect

Since the above code does not specify a selector that matches the :first selector, it will be used with the * selector by default, so the above code will set the font color in all elements to green.

I hope this article will be helpful to everyone’s jQuery programming.