jquery to determine if the child elements of an element exist in sample code

This article is mainly about the elements of jquery to determine the existence of the child elements of the sample code is introduced, need friends can come to the reference, I hope to help you

jquery determines whether a child element exists or not, determining whether a child element exists//First level child element if ($ ("#specialId >img"). Length==0) if ($ ("#specialId: Has (IMG)"). Lengt h==0) {//-----no IMG child Tag-----} else {//-------has an IMG tag------} Two, select a specific ID element     A specific ID child element $ ("#form"). Children ("#t") three, select the child element under a specific ID element $ ("Ul#u>li:nth-child (2)") so four, to determine whether an element exists if ($ ("#myId"). length>0) {//exist}