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Showing content from http://developer.mozilla.org/zh-CN/docs/Web/API/HTMLInputElement/labels below:

HTMLInputElement.labels - Web API | MDN

HTMLInputElement.labels

Baseline Widely available

HTMLInputElement.labels 为只读属性,它返回一个NodeList 实例,绑定当前的<input> 节点的<label> 元素。

语法
var labelElements = input.labels;
Return value

NodeList 包含 <label> 元素和 <input> 元素。

示例 HTML
<label id="label1" for="test">Label 1</label>
<input id="test" />
<label id="label2" for="test">Label 2</label>
JavaScript
window.addEventListener("DOMContentLoaded", function () {
  const input = document.getElementById("test");
  for (var i = 0; i < input.labels.length; i++) {
    console.log(input.labels[i].textContent); // "Label 1" and "Label 2"
  }
});
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