我设法先解析一个带有java代码的json url，但现在需要将它迁移到javascript。当我使用JavaScript解析时，syntaxerror：我发生了意外的令牌
SyntaxError: Unexpected token i in JSON at position 2
at JSON.parse (<anonymous>)
at success (homeCtrl.js:1060)
at processQueue (ionic.bundle.js:29127)
at ionic.bundle.js:29143
at Scope.$eval (ionic.bundle.js:30395)
at Scope.$digest (ionic.bundle.js:30211)
at Scope.$apply (ionic.bundle.js:30503)
at done (ionic.bundle.js:24824)
at completeRequest (ionic.bundle.js:25022)
at XMLHttpRequest.requestLoaded (ionic.bundle.js:24963)
(anonymous) @ ionic.bundle.js:26794
(anonymous) @ ionic.bundle.js:23507
processQueue @ ionic.bundle.js:29135
(anonymous) @ ionic.bundle.js:29143
$eval @ ionic.bundle.js:30395
$digest @ ionic.bundle.js:30211
$apply @ ionic.bundle.js:30503
done @ ionic.bundle.js:24824
completeRequest @ ionic.bundle.js:25022
requestLoaded @ ionic.bundle.js:24963
我的javascript如下：
//scrap singapore
function topVolumeGainerLosersSingapore(type) {
$ionicLoading.show();
var url = "http://www.sgx.com/JsonRead/JsonData?qryId=RStock&timeout=30";
$http({
method: 'GET',
url: url,
transformResponse: undefined,
headers: {
"Content-Type":"text/plain",
"Accept":"text/plain"
}
}).then(function success(response) {
// this function will be called when the request is success
var text = response.data;
//console.log(text);
var replaceData = text.substring(text.indexOf("&&")+2);
//console.log(replaceData);
var newData = JSON.parse(replaceData);
console.log(newData);
}, function error(response) {
// this function will be called when the request returned error status
$ionicLoading.hide();
console.log(response);
});
}
java代码可以正确解析，同一个URL没有错误
public class MainActivity extends AppCompatActivity {
private static final String TAG = MainActivity.class.getSimpleName();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new AsyncTas().execute();
}
private class AsyncTas extends AsyncTask<Void,Void,Void>{
@Override
protected Void doInBackground(Void... voids) {
HttpURLConnection urlConnection = null;
String urlString = "http://www.sgx.com/JsonRead/JsonData?qryId=RStock&timeout=30";
try {
urlConnection = (HttpURLConnection) new URL(urlString).openConnection();
//String result = readIt(new BufferedInputStream(urlConnection.getInputStream()));
BufferedReader bufferedReader = new BufferedReader(
new InputStreamReader(urlConnection.getInputStream()));
// Grab the results
StringBuilder log = new StringBuilder();
String line;
while ((line = bufferedReader.readLine()) != null) {
log.append(line + "\n");
}
String result = log.toString();
result = result.substring(result.indexOf("&&") + 2);
JSONObject jo = new JSONObject(result);
Log.e(TAG, "doInBackground: "+result);
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getApplicationContext(),"Unable to parse json "+e.getMessage(),Toast.LENGTH_LONG).show();
}
return null;
}
}
}
所需的输出如下：
{identifier:'ID', label:'As at 08-03-2017 2:48 PM',items:[{ID:0,N:'3Cnergy',SIP:'',NC:'502',R:'',I:'',M:'t',LT:0.000,C:0.000,VL:0.000,BV:100.000,B:'0.042',S:'0.047',SV:70.000,O:0.000,H:0.000,L:0.000,V:0.000,SC:'2',PV:0.040,PTD:'20170307',BL:'100',EX:'',EJ:'',CLO:'',P:0.0,P_:'X',V_:''},{ID:1,N:'800 Super',SIP:'',NC:'5TG',R:'',I:'',M:'t',LT:1.160,C:-0.020,VL:51.400,BV:10.500,B:'1.160',S:'1.170',SV:10.000,O:1.180,H:1.180,L:1.160,V:60324.500,SC:'A',PV:1.180,PTD:'20170307',BL:'100',EX:'',EJ:'',CLO:'',P:-1.694915234375,P_:'X',V_:''},{ID:2,N:'8Telecom',SIP:'',NC:'AZG',R:'',I:'',M:'',LT:0.000,C:0.000,VL:0.000,BV:5.000,B:'0.130',S:'0.140',SV:10.000,O:0.000,H:0.000,L:0.000,V:0.000,SC:'2',PV:0.135,PTD:'20170306',BL:'100',EX:'',EJ:'',CLO:'',P:0.0,P_:'X',V_:''},{ID:3,N:'A-Smart',SIP:'',NC:'BQC',R:'',I:'',M:'',LT:0.570,C:-0.020,VL:60.000,BV:31.000,B:'0.570',S:'0.580',SV:10.000,O:0.575,H:0.575,L:0.570,V:34350.000,SC:'2',PV:0.590,PTD:'20170307',BL:'100',EX:'',EJ:'',CLO:'',P:-3.38983046875,P_:'X',V_:''},
答案 0 :(得分：3)
似乎源数据不包含有效的JSON数据。根据{{3}}，键是一个String，因此必须用双引号括起来，这也适用于String值：
{ "identifier": "ID" }
正如您的错误所述，解析器期待双引号，而不是i字符。
我建议您首先使用小代码段测试代码，以验证它是否适用于有效的JSON数据。
答案 1 :(得分：1)
使用eval代替。你的json数据不是严格模式。严格模式json数据的密钥必须是双引号。
var json="{} && { identifier: 'ID' }";
function test(json,parser){
try{
console.log("parsing by "+parser.name+" => "+JSON.stringify(parser("("+json+")")));
}catch(e){
console.log('Can not parsed by '+parser.name);
}
}
test(json,JSON.parse);
test(json,eval);
var formats={
strict:'{"foo":"bar"}',
'single-quotes':"{'foo':'bar'}",
'no-quotes':"{foo:'bar'}"
};
function test(parser){
return parser.name+" supports " +Object.keys(formats).reduce(function(supports,format){
try{
parser(formats[format]);
supports.push(format);
}catch(e){
}finally{return supports;}
},[]);
}
function parseJSON(json){
return eval("("+json+")");
}
console.log(test(parseJSON));
console.log(test(JSON.parse));
window.$ = window.jQuery = {};
function foo() {
return 'bar';
}
parse = (function () {
//disable all global keys
eval("var " + Object.keys(window).join(', '));
return function (_) {
return eval("(" + _ + ")");
};
})();
var snippets = [
"window",
"location",
"$",
"jQuery",
"location.href='http://www.example.com'",
'local',
"{foo:'bar'}",
"foo()",
"eval('window')",
'function ref(){return window}()'
];
snippets.forEach(function (snippet) {
var local = 'local value';
var expression = "parse(" + JSON.stringify(snippet) + ")";
try {
console.log(expression + " => " + JSON.stringify(parse(snippet)));
} catch (e) {
console.error(expression + " failed!");
}
});