Node：normalize() 方法

normalize()

<output id="result"></output>

const wrapper = document.createElement("div");

wrapper.appendChild(document.createTextNode("第 1 部分"));
wrapper.appendChild(document.createTextNode("第 2 部分"));

let node = wrapper.firstChild;
let result = "规范化之前：<br/>";
while (node) {
  result += ` ${node.nodeName}：${node.nodeValue}<br/>`;
  node = node.nextSibling;
}

wrapper.normalize();

node = wrapper.firstChild;
result += "<br/><br/>规范化之后：<br/>";
while (node) {
  result += ` ${node.nodeName}：${node.nodeValue}<br/>`;
  node = node.nextSibling;
}

const output = document.getElementById("result");
output.innerHTML = result;