DOM Element.Closest Child

Question

查询DOM时，是否有任何理由将标签作为孩子不可用？

var el = document.getElementById("myEl");
var group = el.closest(".form-group");
var ipt =  el.closest(".form-group > input");
var lbl =  el.closest(".form-group > label");
console.log(ipt);
console.log(lbl);

<div class="row">
  <div class="form-group col-sm-6">
    <label>Name
      <i class="fa fa-asterisk text-danger"></i>
    </label>
    <input type="text" class="form-control" id="myEl" value.bind="location.name & validate">
  </div>
</div>
    

Answer 1

您需要选择父母，而不是寻找孩子，就无法将其组合起来。使用您的代码，它正在寻找输入或标签的父母。

var el = document.getElementById("myEl");
var group = el.closest(".form-group");
var ipt =  group.querySelector("input");
var lbl =  group.querySelector("label");
console.log(ipt);
console.log(lbl);

<div class="row">
  <div class="form-group col-sm-6">
    <label>Name
      <i class="fa fa-asterisk text-danger"></i>
    </label>
    <input type="text" class="form-control" id="myEl" value.bind="location.name & validate">
  </div>
</div>