使用getElementsByClassName 同时匹配父子标签的代码

var parentEls = document.getElementsByClassName('parent-class'); var childEls = []; for (var i = 0; i < parentEls.length; i++) { var el = parentEls[i]; var children = el.getElementsByClassName('child-class'); for (var j = 0; j < children.length; j++) { childEls.push(children[j]); } } console.log(childEls);