XMLHttpRequest().Open 在 Firefox 中不是函数，但在 Chrome 中有效

Question

我有下面的函数，但是当我尝试在 Firefox 中运行它时，我收到错误“xmlhttp.Open 不是函数”。但是，这在 Google Chrome 中不会发生

我是否遗漏了一些从 ActiveXObject 转换的代码？ PAGE 参数已设置并适用于 Internet Explorer 中的 ActiveXObject

function broker(PAGE, PARAMARR, STARTPARAM) {
  var postdata = getPostData();
  var ua = navigator.userAgent;
  var msie = ua.indexOf('MSIE ');
  //var xmlhttp =null;
  if (msie != -1) {
    xmlhttp = new ActiveXObject('MSXML2.XMLHTTP');
    xmlhttp.Open('POST', PAGE, false);
    xmlhttp.setRequestHeader(
      'Content-Type',
      'application/x-www-form-urlencoded; charset=UTF-8'
    );
  } else {
    xmlhttp = new XMLHttpRequest();
    xmlhttp.Open('POST', PAGE, false);
    xmlhttp.setRequestHeader(
      'Content-Type',
      'application/x-www-form-urlencoded; charset=UTF-8'
    );
  }
  var paramno, param;
  for (paramno = STARTPARAM; paramno < PARAMARR.length; paramno++) {
    param = PARAMARR[paramno];
    if (param == void 0) param = '';
    if (param === true) param = -1;
    if (param === false) param = 0;
    postdata = postdata + '&Parameter=' + encodeURIComponent(param);
  }
  xmlhttp.setRequestHeader('Content-Length', postdata.length);
  xmlhttp.send(postdata);
  var response = new String(xmlhttp.responseText);
  var brkmsg = getMessage(response);
  return brkmsg;
}

Chrome：Netscape mozilla/5.0 (windows nt 6.1; wow64) applewebkit/537.36 (khtml, like gecko) chrome/47.0.2526.106 safari/537.36

Firefox: Netscape mozilla/5.0 (windows nt 6.1; wow64; rv:43.0) gecko/20100101 firefox/43.0

IE11：Netscape mozilla/5.0（windows nt 6.1；wow64；trident/7.0；slcc2；.net clr 2.0.50727；.net clr 3.5.30729；.net clr 3.0.30729；媒体中心 pc 6.0；.net4 .0c; .net4.0e; infopath.3; rv:11.0) 像壁虎）

IE8（兼容模式）：Mozilla/4.0（兼容；MSIE 7.0；Windows NT 5.2；WOW64；Trident/4.0；.NET CLR 3.0.4506.2152；.NET CLR 2.0.50727；.NET CLR 3.5.30729；. NET4.0C；.NET4.0E；InfoPath.2)

Answer 1

好像是笔误。用小写写“open”！