validateContent = xmlContent => {
  //errorCode 0是xml正确，1是xml错误，2是无法验证
  var xmlDoc,
    errorMessage,
    errorCode = 0;
  // code for IE
  if (window.ActiveXObject) {
    xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
    xmlDoc.async = "false";
    xmlDoc.loadXML(xmlContent);

    if (xmlDoc.parseError.errorCode != 0) {
      errorMessage = "错误code: " + xmlDoc.parseError.errorCode + "\n";
      errorMessage = errorMessage + "错误原因: " + xmlDoc.parseError.reason;
      errorMessage = errorMessage + "错误位置: " + xmlDoc.parseError.line;
      errorCode = 1;
    } else {
      errorMessage = "格式正确";
    }
  }
  // code for Mozilla, Firefox, Opera, chrome, safari,etc.
  else if (document.implementation.createDocument) {
    var parser = new DOMParser();
    xmlDoc = parser.parseFromString(xmlContent, "text/xml");
    var error = xmlDoc.getElementsByTagName("parsererror");
    if (error.length > 0) {
      if (xmlDoc.documentElement.nodeName == "parsererror") {
        errorCode = 1;
        errorMessage = xmlDoc.documentElement.childNodes[0].nodeValue;
      } else {
        errorCode = 1;
        errorMessage = xmlDoc.getElementsByTagName("parsererror")[0].innerText;
      }
    } else {
      errorMessage = "格式正确";
    }
  } else {
    errorCode = 2;
    errorMessage = "浏览器不支持验证，无法验证xml正确性";
  }

  return {
    msg: errorMessage,
    errorCode
  };
};

try {
  const jsonFileContent = JSON.parse(fileContent);
  if (typeof jsonFileContent == "object") {
    formatValidate = true;
  }
} catch (error) {
  err("输入格式不正确，请输入正确JSON格式");
}