syntax error: unexpected token <

2019-01-13 14:49发布

站内问答 / jQuery
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I've tried many things and there's no way, always appears this error I tried to use only one option to see if passed, changed the call of jquery, but not.

I looked in various places on the internet about this error, but could not solve or understand why it is happening. On my pc using EasyPHP works perfectly, but when I put online does not work.

Syntax Error: unexpected token <

Here's my code:

$(function(){
$('#salvar').click(function(){
    var key = 'salvar';
    var title = $('#title').val();
    var opcao1 = $('#opcao1').val();
    var opcao2 = $('#opcao2').val();
    var opcao3 = $('#opcao3').val();
    var opcao4 = $('#opcao4').val();
    var opcao5 = $('#opcao5').val();
    var opcao6 = $('#opcao6').val();

    if(title.length > 0){
        if(opcao2.length > 0){
            $('#resposta').removeClass().html('Salvando a enquete...<br clear="all"><br><img src="images/switch-loading.gif" />');
            $.ajax({
            type : 'POST',
            url : 'funcoes/enquete_adm.php',
            dataType : 'json',
            data: {key:key,title:title,opcao1:opcao1,opcao2:opcao2,opcao3:opcao3,opcao4:opcao4,opcao5:opcao5,opcao6:opcao6},
            success : function(data){
                if(data.sql == 'ok'){
                        $('#resposta').addClass('success-box').html('Enquete Salva!').fadeIn(1000);
                        $('#control').fadeOut();
                    }else if(data.sql == 'error'){
                        $('#resposta').addClass('info-box').html('Ops, aconteceu um erro. Por favor, tente novamente').fadeIn(1000);
                    }
                },
            error: function (XMLHttpRequest, textStatus, errorThrown) {    
                alert("XMLHttpRequest " + XMLHttpRequest[0]);alert(" errorThrown: " + errorThrown);alert( " textstatus : " + textStatus);    
            }
            });
        }else{
            $('#resposta').addClass('warning-box').html('É necessário no mínimo duas opções');
        };
    }else{
        $('#resposta').addClass('warning-box').html('Coloque a pergunta da enquete');
    };
    return false;

});
}); // End

15条回答
劫难
2楼-- · 2019-01-13 15:08

The error SyntaxError: Unexpected token < likely means the API endpoint didn't return JSON in its document body, such as due to a 404.

In this case, it expects to find a { (start of JSON); instead it finds a < (start of a heading element).

Successful response: 

<html>
  <head></head>
  <body>
    {"foo": "bar", "baz": "qux"}
  </body>
</html>

Not-found response: 

<html>
  <head></head>
  <body>
    <h1>Not Found</h1>
    <p>The requested URL was not found on the server.  If you entered the URL manually please check your spelling and try again.</p>
  </body>
</html>

Try visiting the data endpoint's URL in your browser to see what's returned.

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老娘就宠你
3楼-- · 2019-01-13 15:11

Just ignore parameter passing as a false in java script functions

Ex: 

function getCities(stateId,locationId=false){    

    // Avoid writting locationId= false kind of statements
   /*your code comes here*/

 }

Avoid writting locationId= false kind of statements, As this will give the error in chrome and IE

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干净又极端
4楼-- · 2019-01-13 15:14

Just gonna throw this in here since I encountered the same error but for VERY different reasons.

I'm serving via node/express/jade and had ported an old jade file over. One of the lines was to not bork when Typekit failed:

script(type='text/javascript')
  try{Typekit.load();}catch(e){}

It seemed innocuous enough, but I finally realized that for jade script blocks where you're adding content you need a .:

script(type='text/javascript').
  try{Typekit.load();}catch(e){}

Simple, but tricky.

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Bombasti
5楼-- · 2019-01-13 15:16

This happened to me with a page loaded in via an iframe. The iframe src page had a 404 script reference. Obviously I couldn't find the script reference in the parent page, so it took me a while to find the culprit.

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爷的心禁止访问
6楼-- · 2019-01-13 15:17

This error can also arise from a JSON AJAX call to a PHP script that has an error in its code. Servers are often set up to return PHP error information formatted with html markup. This response is interpreted as invalid JSON, resulting in the "unexpected token <" AJAX error.

To view the PHP error using Chrome, go to the Network panel in the web inspector, click the PHP file listed on the left side, and click on the Response tab.

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混吃等死
7楼-- · 2019-01-13 15:17

I was also having syntax error: unexpected token < while posting a form via ajax. Then I used curl to see what it returns:

curl -X POST --data "firstName=a&lastName=a&email=array@f.com&pass=aaaa&mobile=12345678901&nID=123456789123456789&age=22&prof=xfd" http://handymama.co/CustomerRegistration.php

I got something like this as a response: 

<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/handymama/public_html/CustomerRegistration.php:1) in <b>/home/handymama/public_html/CustomerRegistration.php</b> on line <b>3</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/handymama/public_html/CustomerRegistration.php:1) in <b>/home/handymama/public_html/CustomerRegistration.php</b> on line <b>4</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/handymama/public_html/CustomerRegistration.php:1) in <b>/home/handymama/public_html/CustomerRegistration.php</b> on line <b>7</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/handymama/public_html/CustomerRegistration.php:1) in <b>/home/handymama/public_html/CustomerRegistration.php</b> on line <b>8</b><br />

So all I had to do is just change the log level to only errors rather than warning.

error_reporting(E_ERROR);
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