不知道如何调试类似的东西：Uncaught SyntaxError: Unexpected token [

Question

So I know this is a topic that always gets downvoted no matter what. But I have this page and it used to work fine. I don't know what happened but one day it says:

Uncaught SyntaxError: Unexpected token [

While this is part of my JS object, and it always worked fine. I've gone over all my code to see if I didn't forget any brackets or semicolons, but I can find nothing...

Can someone just advice me on how to debug something like this? Cheers!

Here's my JS function until the error. The error is shown even before the console.log happens which is written above it! How weird is that!

fill_grid_json = function(jsonData, result_count){

p_num = parseInt($("#p_num").val());
item_num = parseInt($("#item_num").val());
if(isNaN(item_num)){
    item_num = 20;
}
console.log("m p_num: "+p_num);
console.log("m item_num: "+item_num);

    /*=================＼
    |   Calculate Pages |
    ＼=================*/

calculatePages(result_count,p_num,item_num);

// Calculate item range 
var toItemX = item_num*p_num;
var fromItemX = toItemX-item_num;

if(toItemX>result_count){
    toItemX = result_count;
}
console.log("item range: "+(fromItemX+1)+"-"+toItemX+" / "+result_count);

//Item amount etc.
var hitNum = "<span>"+(fromItemX+1)+"-"+toItemX+"　/　"+result_count+"</span><span class='item_unit'>items</span>";
$(".hit_num").html(hitNum);




var gridItems = []; // Grid Items container array
$.each(jsonData, function(i) {
if(jsonData[i].img_src!=null && jsonData[i].img_src!=""){

    // get JS variables
    var id = jsonData[i].ID;
    var post_title = jsonData[i].post_title;
    var supplier_company = jsonData[i].supplier_company;
    var img_src = jsonData[i].img_src[0];
    var tags = jsonData[i].tags;
    var post_meta = jsonData[i].post_meta;

      //``````````````````````//
     //     MAKE THE GRID ITEM 
    //,,,,,,,,,,,,,,,,,,,,,,//

/*******************
    Make the necessary pieces    
********************/

// Add GP Incentive
var post_meta['exw_from_usd'] = GPincentive(post_meta['exw_from_usd']);
var post_meta['exw_to_usd'] = GPincentive(post_meta['exw_to_usd']);     

There at the very end: post_meta['exw_from_usd'] it bugs. However, this used to never be a problem and always worked... So i'm really confused.

Answer 1

You clearly have changed it, because this is invalid code:

var post_meta['exw_from_usd'] = GPincentive(post_meta['exw_from_usd']);

It's valid without the var at the beginning. With the var it's invalid and always has been.

I suppose it's possible that you used to visit with a browser whose JavaScript engine ignored the error before, but...