Javascript 循环遍历 JSON 数组

Question

I am trying to loop through a JSON array that looks like the following -

 var results = [{"city_name":"Bradford","counter":1},{"city_name":"Aberdeen","counter":1},{"city_name":"Aberfeldy","counter":1},{"city_name":"Aberaeron","counter":1},{"city_name":"Aberdare","counter":0},{"city_name":"Abergavenny","counter":0},{"city_name":"Abergele","counter":0}]; for(var i = 0; i < results.length; i++) { var obj = results[i]; console.log(obj.city_name); console.log(obj.counter); }

but all I get is undefined in the alert.

Answer 1

its working

 let results=[{"city_name":"Bradford","counter":1},{"city_name":"Aberdeen","counter":1},{"city_name":"Aberfeldy","counter":1},{"city_name":"Aberaeron","counter":1},{"city_name":"Aberdare","counter":0},{"city_name":"Abergavenny","counter":0},{"city_name":"Abergele","counter":0}] for(var i = 0; i < results.length; i++) { var obj = results[i]; console.log(obj.city_name); console.log(obj.counter); } //second way results.forEach(a=>{ console.log(a.city_name); console.log(a.counter); })

Answer 2

Not exactly understand you but maybe it's hepls

 const results = [{"city_name":"Bradford","counter":1},{"city_name":"Aberdeen","counter":1},{"city_name":"Aberfeldy","counter":1},{"city_name":"Aberaeron","counter":1},{"city_name":"Aberdare","counter":0},{"city_name":"Abergavenny","counter":0},{"city_name":"Abergele","counter":0}] for(let i in results) { console.log("city_name",results[i].city_name); console.log("counter",results[i].counter); }

Answer 3

I tried your code and it works. But better to write it like this:

results.forEach(result => alert(result.city_name));

In any case, it should work even with your syntax.