Javascript 循環遍歷 JSON 數組

Question

我正在嘗試遍歷一個如下所示的 JSON 數組 -

 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); }

但我得到的只是在警報中未定義。

Answer 1

它的工作

 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

不完全理解你，但也許是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

我試過你的代碼，它有效。 但最好這樣寫：

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

在任何情況下，它都應該適用於您的語法。