如何在javascript中將字符串轉換為符號

Question

我有以下格式的json數據。

 var jsonData={
"India":["Australia","New Zealand","Pakistan","England"],
"Pakistan":["New Zealand","India","England"],
"Bangladesh":["New Zealand","India","England","SouthAfrica","Australia"],
"Srilanka":["New Zealand","India","England","SouthAfrica","Australia"],
"Australia":["New Zealand","Pakistan","India"],
"New Zealand":["Pakistan","India","England","SouthAfrica","Australia"],
"SouthAfrica":["Srilanka","India","Pakistan"],
"England":["Srilanka","New Zealand","Pakistan","Bangladesh"]
 };

我將從下拉列表中獲取國家名稱。用戶選擇。

  var countryName=document.getElementById("pop1").value;

現在我想根據countryName值從json數據中獲取特定的國家/地區數據。

例如。如果countryName值等於India那么它應該返回jsonData.India數據。

這該怎么做。

謝謝

Answer 1

你需要傳遞你的變量：

jsonData[ countryName ]

所以基本上你可以通過兩種方式訪問​​JS中的對象屬性：

sobeObj.value

要么

someObj[ 'value' ]

括號內可以是表示字符串的字符串或變量。

Answer 2

像那樣：

var countryName = 'India';
var countries = jsonData[countryName];