This article mainly introduces JS using a for loop to search elements with an array traversal of child nodes
function nextChildNode(node,clazz,tagName){ var count= node.childElementCount; for(var i=0;i<count;i++){ if(node==undefined || node.children[i]==undefined){ continue; } if(clazz){ if(node.children[i].getAttribute('class')==clazz){ return node.children[i]; } }else{ if(node.children[i].tagName==tagName){ return node.children[i]; } } } return null; } function getChildNode(node,classArg,tagNodeArg){ for(var i=0;i<classArg.length;i++){ node=nextChildNode(node,classArg[i]); } for(var i=0;i<tagNodeArg.length;i++){ node=nextChildNode(node,null,tagNodeArg[i]); } return node; } function getItemId(node){ var classNode=['itemInfo','itemDesc'],tagNode=['P','BUTTON']; node=getChildNode(node,classNode,tagNode); alert(node.getAttribute('itemid')); } #Calling the function getItemId($(".shopItem")[0]);