每次我尝试保存表单时，XMLHttpRequest都会发送空表单数据

Question

我遇到了一个问题，我尝试保存表单，每次将空数据发送到服务器。 这只发生在Windows Chrome浏览器上。在Mac Chrome上，它运行得非常好。

try {
  if (typeof XMLHttpRequest.prototype.sendAsBinary == 'undefined') {
    XMLHttpRequest.prototype.sendAsBinary = function(text){
      var data = new ArrayBuffer(text.length);
      var ui8a = new Uint8Array(data, 0);
      for (var i = 0; i < text.length; i++) ui8a[i] = (text.charCodeAt(i) & 0xff);
      this.send(ui8a);
    };
  }
} catch (e) {}


var AJAXSubmit = (function () {

  function ajaxSuccess () {
    /* console.log("AJAXSubmit - Success!"); */
    alert("Saved successfully");
    /* you can get the serialized data through the "submittedData" custom property: */
     //alert(JSON.stringify(this.submittedData)); 

  }

  function ajaxError() {

    alert("Sorry, there was an error. Please save again.");
  }

  function submitData (oData) {
    /* the AJAX request... */
    var oAjaxReq = new XMLHttpRequest();
    console.log(oAjaxReq);
    oAjaxReq.submittedData = oData;
    oAjaxReq.timeout = 10000;
    oAjaxReq.ontimeout = ajaxError;
    oAjaxReq.onerror = ajaxError;

    if (oData.technique === 0) {
      /* method is GET */
      oAjaxReq.open("get", oData.receiver.replace(/(?:\?.*)?$/, oData.segments.length > 0 ? "?" + oData.segments.join("&") : ""), true);
      oAjaxReq.send(null);
    } else {
      /* method is POST */
      oAjaxReq.open("post", oData.receiver, true);
      if (oData.technique === 3) {
        /* enctype is multipart/form-data */
        var sBoundary = "---------------------------" + Date.now().toString(16);
        //oAjaxReq.setRequestHeader("Content-Type", "multipart\/form-data; boundary=" + sBoundary);
        oAjaxReq.sendAsBinary("--" + sBoundary + "\r\n" + oData.segments.join("--" + sBoundary + "\r\n") + "--" + sBoundary + "--\r\n");
        oAjaxReq.onreadystatechange = function(){
            if(oAjaxReq.readyState==4 && oAjaxReq.status ==200 && oAjaxReq.response == "1"){
            oAjaxReq.onload = ajaxSuccess;
            }
            if(oAjaxReq.readyState==4 && oAjaxReq.status ==200 && oAjaxReq.response == "2"){
            oAjaxReq.onload = ajaxError;
            }
            if(oAjaxReq.readyState!=4 && oAjaxReq.status !=200){
            oAjaxReq.onload = ajaxError;
            }

        };
      } else {
        /* enctype is application/x-www-form-urlencoded or text/plain */
        oAjaxReq.setRequestHeader("Content-Type", oData.contentType);
        oAjaxReq.send(oData.segments.join(oData.technique === 2 ? "\r\n" : "&"));

      }
    }
  }

  function processStatus (oData) {
    if (oData.status > 0) {  return; }
    /* the form is now totally serialized! do something before sending it to the server... */
    /* doSomething(oData); */
    /* console.log("AJAXSubmit - The form is now serialized. Submitting..."); */

    submitData (oData);
  }

  function pushSegment (oFREvt) {
    this.owner.segments[this.segmentIdx] += oFREvt.target.result + "\r\n";
    this.owner.status--;
    processStatus(this.owner);
  }

  function plainEscape (sText) {
    /* how should I treat a text/plain form encoding? what characters are not allowed? this is what I suppose...: */
    /* "4\3\7 - Einstein said E=mc2" ----> "4\\3\\7\ -\ Einstein\ said\ E\=mc2" */
    return sText.replace(/[\s\=\\]/g, "\\$&");
  }

  function SubmitRequest (oTarget) {
    var nFile, sFieldType, oField, oSegmReq, oFile, bIsPost = oTarget.method.toLowerCase() === "post";
    /* console.log("AJAXSubmit - Serializing form..."); */
    //console.log(oTarget);
    this.contentType = bIsPost && oTarget.enctype ? oTarget.enctype : "application\/x-www-form-urlencoded";
    this.technique = bIsPost ? this.contentType === "multipart\/form-data" ? 3 : this.contentType === "text\/plain" ? 2 : 1 : 0;
    this.receiver = oTarget.action;
    this.status = 0;
    this.segments = [];
    var fFilter = this.technique === 2 ? plainEscape : escape;
    for (var nItem = 0; nItem < oTarget.elements.length; nItem++) {
      oField = oTarget.elements[nItem];
      if (!oField.hasAttribute("name")) { continue; }
      sFieldType = oField.nodeName.toUpperCase() === "INPUT" ? oField.getAttribute("type").toUpperCase() : "TEXT";
      if (sFieldType === "FILE" && oField.files.length > 0) {
        if (this.technique === 3) {
          /* enctype is multipart/form-data */
          for (nFile = 0; nFile < oField.files.length; nFile++) {
            oFile = oField.files[nFile];
            oSegmReq = new FileReader();
            /* (custom properties:) */
            oSegmReq.segmentIdx = this.segments.length;
            oSegmReq.owner = this;
            /* (end of custom properties) */
            oSegmReq.onload = pushSegment;
            this.segments.push("Content-Disposition: form-data; name=\"" + oField.name + "\"; filename=\""+ oFile.name + "\"\r\nContent-Type: " + oFile.type + "\r\n\r\n");
            this.status++;
            oSegmReq.readAsBinaryString(oFile);
          }
        } else {
          /* enctype is application/x-www-form-urlencoded or text/plain or method is GET: files will not be sent! */
          for (nFile = 0; nFile < oField.files.length; this.segments.push(fFilter(oField.name) + "=" + fFilter(oField.files[nFile++].name)));
        }
      } else if ((sFieldType !== "RADIO" && sFieldType !== "CHECKBOX") || oField.checked) {
        /* field type is not FILE or is FILE but is empty */
        this.segments.push(
          this.technique === 3 ? /* enctype is multipart/form-data */
            "Content-Disposition: form-data; name=\"" + oField.name + "\"\r\n\r\n" + oField.value + "\r\n"
          : /* enctype is application/x-www-form-urlencoded or text/plain or method is GET */
            fFilter(oField.name) + "=" + fFilter(oField.value)
        );
      }
    }

    processStatus(this);
  }

  return function (oFormElement) {
    if (!oFormElement.action) { return; }
    new SubmitRequest(oFormElement);
  };

})();

我使用了Mozilla Developers Page中的代码。这是指向它的链接。 https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest#A_little_vanilla_framework