How to determine if there are child elements in jquery

Jquery method to determine whether there are sub-elements: 1. To determine whether a specific sub-element exists, the code is [if ($( "#specialId:has(img)" ).length==0)]; 2 , select a specific id sub-element under a specific id element, the code is [$("#form" )...].

The operating environment of this tutorial: Windows 7 system, jquery version 3.3.1. This method is suitable for all brands of computers.

Jquery method to determine whether there are sub-elements:

1. Determine whether a specific sub-element exists

if ($( "#specialId:has(img)" ).length==0) {   // 一级子元素
  // 没有img子标记
} else {   
  // 有img子标记   
}

2. Select the element under a specific id Specific id sub-element

$("#form" ).children( "#t" )

3. Select the sub-element under the specific id element

$("ul#u>li:nth-child(2)" )

4. Determine whether an element exists

if ($( "#myId" ).length>0){ 
   //存在    
}

5. Determine whether an element exists Whether there are child elements for each element

if ($( "#myId" ).children().length>0){ 
   //存在    
}

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