Sample Code for jquery to determine whether the child element of an element exists _ jquery-js tutorial

This article mainly introduces the sample code for jquery to determine whether the child element of an element exists. If you need it, you can refer to it and hope to help jquery determine whether the child element exists.

1. Determine whether a child element exists
// If ($ ("# specialId> img"). length = 0)
If ($ ("# specialId: has (img)"). length = 0)
{
// ----- No img sub-mark -----
}
Else
{
// ------- There is an img submark ------
}

2. Select a specific id sub-element under a specific id Element
$ ("# Form"). children ("# t") so

3. Select child elements under a specific id Element
$ ("Ul # u> li: nth-child (2)") so

4. determine whether an element exists
If ($ ("# myId"). length> 0)
{
// Exists
}