QuillJS。如何从图像和Delta的末端删除换行符？

Question

Delta在图像中和最后都有换行符，当我调用JSON.parse时会导致错误。

enter image description here

    var Font = Quill.import('formats/font');
    Font.whitelist = ['arial', 'times-new-roman', 'tahoma', 'verdana', 'trebuchet-ms', 'impact'];
    Quill.register(Font, true);

    var toolbarOptions = [
      [{ 'font': ['arial', 'times-new-roman', 'tahoma', 'verdana', 'trebuchet-ms', 'impact'] }],
      [{'size': ['small', false, 'large', 'huge']}],
      ['bold', 'italic', 'underline', 'strike'],
      ['blockquote'],
      [{'list': 'ordered'}, {'list': 'bullet'}],
      [{'script': 'sub'}, {'script': 'super'}],
      [{'indent': '-1'}, {'indent': '+1'}],
      [{'direction': 'rtl'}],
      ['link', 'image', 'video'],
      [{'color': []}, {'background': []}],
      [{ 'align': [] }],
      //['clean']
    ];
    var quill = new Quill('#editor', {
      modules: {
        toolbar: toolbarOptions
      },
      theme: 'snow'
    });

    $('#saveDelta').click(function(){
      var delta = quill.getContents();
      var dados_json = JSON.stringify(delta);

      var op = 9;

      var info_obj = {
        op: op,
        dados: dados_json
      }

      var info_json = JSON.stringify(info_obj);

      var ajax = ajaxObj("POST", "server.php");
      ajax.onreadystatechange = function() {
        if(ajaxReturn(ajax) == true) {
            _('exibir').innerHTML = ajax.responseText;
          } else {
            console.log(ajax.responseText);
          }
        }
      ajax.send("info_json="+info_json);

    });

    $('#exibirDelta').click(function(){
      var op = "9";

      var ajax = ajaxObj("POST", "server.php");
      ajax.onreadystatechange = function() {
        if(ajaxReturn(ajax) == true) {
          var response = ajax.responseText.trim();

          var last_quot = response.lastIndexOf('"');
          var res = response.slice(0, last_quot);
          var quot = res.lastIndexOf('"');
          var res2 = response.slice(0, quot);
          var res3 = res2+'"\\n"}]}';

          var exibirQuill = new Quill('#show');
          exibirQuill.setContents(JSON.parse(res3));
          exibirQuill.enable(false);
          } else {
            console.log("error");
          }
        }
      ajax.send("op="+op);
    });

response.slice或str.replace（/ \ n / g，“”）解决了Delta末尾的问题，但是图像继续出现问题。有什么可以防止这种情况发生的吗？还是在后一种情况下，删除图像中的换行符？