我是angualr 2的新手，当我使用xml2json库将xml转换为json时出现错误
我附加了dataservice和xml文件以供参考
当我在assests文件夹中加载本地xml文件主机时，下面是我的错误
ERROR SyntaxError: Unexpected token { in JSON at position 2
at Object.parse (<anonymous>)
at MapSubscriber.project (data.service.ts:22)
at MapSubscriber._next (map.js:77)
at MapSubscriber.Subscriber.next (Subscriber.js:89)
at XMLHttpRequest.onLoad (http.es5.js:1205)
at ZoneDelegate.webpackJsonp.579.ZoneDelegate.invokeTask (zone.js:398)
at Object.onInvokeTask (core.es5.js:4136)
at ZoneDelegate.webpackJsonp.579.ZoneDelegate.invokeTask (zone.js:397)
at Zone.webpackJsonp.579.Zone.runTask (zone.js:165)
at XMLHttpRequest.ZoneTask.invoke (zone.js:460)
import { Injectable } from '@angular/core';
import { Http, Response, Headers } from '@angular/http';
import { Observable } from 'rxjs';
import 'rxjs/operator/map';
import 'rxjs/operator/catch';
import 'rxjs/observable/throw';
import { xml2js } from 'xml2js';
@Injectable()
export class DataService {
constructor(private http: Http) {
}
getLoginData(){
return this.http.get('https://api.myjson.com/bins/zsjzj')
.map((data:Response) => data.json())
.catch(this.getError);
}
getCompanies(){
return this.http.get('http://localhost:4200/assets/data/data.xml').map(res => JSON.parse(this.xml2json(res.text(),'')));
}
private getError(error: Response):Observable<String>{
return Observable.throw(error.json() || 'Server Issue');
}
createAuthorizationHeader(headers:Headers) {
headers.append('Authorization', 'Basic ' +
btoa('a20e6aca-ee83-44bc-8033-b41f3078c2b6:c199f9c8-0548-4be7-9655-7ef7d7bf9d20'));
}
xml2json(xml, tab) {
var X = {
toObj: function(xml) {
var o = {};
if (xml.nodeType==1) { // element node ..
if (xml.attributes.length) // element with attributes ..
for (var i=0; i<xml.attributes.length; i++)
o["@"+xml.attributes[i].nodeName] = (xml.attributes[i].nodeValue||"").toString();
if (xml.firstChild) { // element has child nodes ..
var textChild=0, cdataChild=0, hasElementChild=false;
for (var n=xml.firstChild; n; n=n.nextSibling) {
if (n.nodeType==1) hasElementChild = true;
else if (n.nodeType==3 && n.nodeValue.match(/[^ \f\n\r\t\v]/)) textChild++; // non-whitespace text
else if (n.nodeType==4) cdataChild++; // cdata section node
}
if (hasElementChild) {
if (textChild < 2 && cdataChild < 2) { // structured element with evtl. a single text or/and cdata node ..
X.removeWhite(xml);
for (var n=xml.firstChild; n; n=n.nextSibling) {
if (n.nodeType == 3) // text node
o["#text"] = X.escape(n.nodeValue);
else if (n.nodeType == 4) // cdata node
o["#cdata"] = X.escape(n.nodeValue);
else if (o[n.nodeName]) { // multiple occurence of element ..
if (o[n.nodeName] instanceof Array)
o[n.nodeName][o[n.nodeName].length] = X.toObj(n);
else
o[n.nodeName] = [o[n.nodeName], X.toObj(n)];
}
else // first occurence of element..
o[n.nodeName] = X.toObj(n);
}
}
else { // mixed content
if (!xml.attributes.length)
o = X.escape(X.innerXml(xml));
else
o["#text"] = X.escape(X.innerXml(xml));
}
}
else if (textChild) { // pure text
if (!xml.attributes.length)
o = X.escape(X.innerXml(xml));
else
o["#text"] = X.escape(X.innerXml(xml));
}
else if (cdataChild) { // cdata
if (cdataChild > 1)
o = X.escape(X.innerXml(xml));
else
for (var n=xml.firstChild; n; n=n.nextSibling)
o["#cdata"] = X.escape(n.nodeValue);
}
}
if (!xml.attributes.length && !xml.firstChild) o = null;
}
else if (xml.nodeType==9) { // document.node
o = X.toObj(xml.documentElement);
}
else
alert("unhandled node type: " + xml.nodeType);
return o;
},
toJson: function(o, name, ind) {
var json = name ? ("\""+name+"\"") : "";
if (o instanceof Array) {
for (var i=0,n=o.length; i<n; i++)
o[i] = X.toJson(o[i], "", ind+"\t");
json += (name?":[":"[") + (o.length > 1 ? ("\n"+ind+"\t"+o.join(",\n"+ind+"\t")+"\n"+ind) : o.join("")) + "]";
}
else if (o == null)
json += (name&&":") + "null";
else if (typeof(o) == "object") {
var arr = [];
for (var m in o)
arr[arr.length] = X.toJson(o[m], m, ind+"\t");
json += (name?":{":"{") + (arr.length > 1 ? ("\n"+ind+"\t"+arr.join(",\n"+ind+"\t")+"\n"+ind) : arr.join("")) + "}";
}
else if (typeof(o) == "string")
json += (name&&":") + "\"" + o.toString() + "\"";
else
json += (name&&":") + o.toString();
return json;
},
innerXml: function(node) {
var s = ""
if ("innerHTML" in node)
s = node.innerHTML;
else {
var asXml = function(n) {
var s = "";
if (n.nodeType == 1) {
s += "<" + n.nodeName;
for (var i=0; i<n.attributes.length;i++)
s += " " + n.attributes[i].nodeName + "=\"" + (n.attributes[i].nodeValue||"").toString() + "\"";
if (n.firstChild) {
s += ">";
for (var c=n.firstChild; c; c=c.nextSibling)
s += asXml(c);
s += "</"+n.nodeName+">";
}
else
s += "/>";
}
else if (n.nodeType == 3)
s += n.nodeValue;
else if (n.nodeType == 4)
s += "<![CDATA[" + n.nodeValue + "]]>";
return s;
};
for (var c=node.firstChild; c; c=c.nextSibling)
s += asXml(c);
}
return s;
},
escape: function(txt) {
return txt.replace(/[\\]/g, "\\\\")
.replace(/[\"]/g, '\\"')
.replace(/[\n]/g, '\\n')
.replace(/[\r]/g, '\\r');
},
removeWhite: function(e) {
e.normalize();
for (var n = e.firstChild; n; ) {
if (n.nodeType == 3) { // text node
if (!n.nodeValue.match(/[^ \f\n\r\t\v]/)) { // pure whitespace text node
var nxt = n.nextSibling;
e.removeChild(n);
n = nxt;
}
else
n = n.nextSibling;
}
else if (n.nodeType == 1) { // element node
X.removeWhite(n);
n = n.nextSibling;
}
else // any other node
n = n.nextSibling;
}
return e;
}
};
if (xml.nodeType == 9) // document node
xml = xml.documentElement;
var json = X.toJson(X.toObj(X.removeWhite(xml)), xml.nodeName, "\t");
return "{\n" + tab + (tab ? json.replace(/\t/g, tab) : json.replace(/\t|\n/g, "")) + "\n}";
}
}
// login service : https://api.myjson.com/bins/zsjzj<?xml version="1.0" encoding="UTF-8"?>
<tomcat-users>
<role rolename="demo"/>
<role rolename="manager"/>
<role rolename="admin"/>
<user username="jitendra" password="godigital" roles="demo"/>
<user username="admin" password="admin" roles="admin, manager, manager-gui, manager-script"/>
<user username="arti" password="godigital" roles="demo"/>
<user username="salman" password="milesmobility" roles="admin,demo,manager"/>
<user username="admin" password="eMobility@123" roles="admin,manager"/>
<user username="keshav" password="godigital" roles="demo"/>
<user username="mandar" password="godigital" roles="demo"/>
<user username="subhendu" password="godigital" roles="demo"/>
<user password="tomcat" roles="tomcat,manager-gui,manager-script,admin" username="tomcat"/>
</tomcat-users>