javascript - 在 jquery ajax 调用之外访问变量数据

Question

$.post("http://openexchangerates.org/", parameters,
    function (data) {
        var currencyData = eval('( '+data+')');
        currency = currencyData["currency"];
    }
);
// I want to access currency here. But I am unable to access it.

Answer 1

尝试在 ajax 函数之外声明货币变量。 如果它返回“未定义”(用于调试目的)，您可以首先将其设置为默认值以防止歧义

function getCurrency(){

    var currency = 'debug'; //TODO: remove this value once code works. 

    $.post("http://openexchangerates.org/", parameters,
        function (data) {
        var currencyData = eval('( '+data+')');
        currency = currencyData["currency"];
    }
    );

    console.log(currency);

}