merge.html

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>i18nExcel2Json</title>
  <script src="https://cdn.sheetjs.com/xlsx-0.20.1/package/dist/xlsx.full.min.js"></script>
  <style>
    .result {
      display: flex;

    }

    textarea {
      flex: 1;
      height: 800px;
    }

    * {
      user-select: none;
    }

    pre {
      user-select: all;
    }

    .txt {
      display: flex;
    }

    .txt div {
      flex: 1;
    }
  </style>
</head>

<body>
  <button id="btn">合并</button>
  <button id="btn2">复制结果</button>
  <a href="./index.html" target="_blank">跳转：excel2json</a>
  <div class="txt">
    <div>原JSON：</div>
    <div>新增JSON：</div>
    <div>结果JSON：</div>
  </div>
  <div class="result">
    <textarea name="" id="j1"></textarea>
    <textarea name="" id="j2"></textarea>
    <textarea name="" id="result"></textarea>
  </div>

  <script>
    function isObject(item) {
      return item && typeof item === 'object' && !Array.isArray(item);
    }
    function mergeDeep(target, ...sources) {
      if (!sources.length) return target;
      const source = sources.shift();

      if (isObject(target) && isObject(source)) {
        for (const key in source) {
          if (isObject(source[key])) {
            if (!target[key]) Object.assign(target, { [key]: {} });
            mergeDeep(target[key], source[key]);
          } else {
            Object.assign(target, { [key]: source[key] });
          }
        }
      }
      return mergeDeep(target, ...sources);
    }
    const j1 = document.querySelector('#j1')
    const j2 = document.querySelector('#j2')
    const result = document.querySelector('#result')
    document.querySelector('#btn').addEventListener('click', () => {
      let json1 = JSON.parse(j1.value)
      let json2 = JSON.parse(j2.value)
      result.value = JSON.stringify(mergeDeep(json1, json2), null, 2)
      navigator.clipboard.writeText(result.value)
    })
    document.querySelector('#btn2').addEventListener('click', () => {
      try {
        navigator.clipboard.writeText(result.value)
      } catch (error) {
        alert('复制失败，请手动复制')
      }
    })
  </script>
</body>

</html>