需要幫助訪問JSON數組對象

Question

目標：該代碼收集一個數組JSONAPIS並將該APIS傳遞到$ .each（）循環中。 然后，在if語句中評估JSON數據字段並用於計算precip。 如何從obj訪問JSONAPIS。 主要問題：每日數組成員上的obj.daily.data.length未定義。 obj應該包含要使用的API調用之一和JSON數據集。 相反，它包含諸如abort之類的關鍵字，總是承諾，我不熟悉該如何使用。 什么將訪問結果JSON對象屬性？

var listAPIs = "";
var darkForecastAPI = [];
var result = [];
var JSONAPIS = [];

$.each(numDaysAPITimes, function(a, time) {
    var darkForecastAPI = /*"http://api.wunderground.com/api/" + currentAPIKey + "/history_" + time + "/q/" + state + "/" + city +".json?callback=?"; */
        "http://api.forecast.io/forecast/" + currentAPIKey + "/" + city + time + "?callback=?";
    //https://api.forecast.io/forecast/APIKEY/LATITUDE,LONGITUDE,TIME
    JSONAPIS.push($.getJSON(darkForecastAPI, {
        tags: "WxAPI[" + i + "]", //Is this tag the name of each JSON page? I tried to index it incase this is how to refer to the JSON formatted code from the APIs.
        tagmode: "any",
        format: "json"
    }));
});
$.when.apply($, JSONAPIS).done(function(result) { /*no log simply an array */
    var eachPrecipSum = 0.0;
    var totalPrecipSinceDate = 0.0;
    alert(result);

    $.each(result, function(d, obj) {
    console.log(obj);
        for (var c = 0; c <= obj.daily.data.length - 1; c++) {
            if (obj.daily.data[c].precipIntensity >= 0.0000 && obj.daily.data[c].precipType == "rain") /*Number(result.history.dailysummary.precipm, result.history.dailysummary.rain*/ {
                eachPrecipSum = result[d].daily.data[c].precipIntensity;
                totalPrecipSinceDate = eachPrecipSum + totalPrecipSinceDate; ///Write mean precip
                alert(Math.round(eachPrecipSum * 10000) / 10000);
                $("body").append("p").text("There has been as least a total of " + Math.round(totalPrecipSinceDate * 10000) / 10000 + " inches per hour of rain at the location in the last " + userDataDatePick + " days")

            } else if (obj.daily.data[c].precipIntensity >= 0.0000 && obj.daily.data[c].precipType != "rain") {
                alert("There is was no rain on ____" /*+ result.history.dailysummary.mon + "/" + result.history.dailysummary.mday + "/" + result.history.dailysummary.year*/ );
            }
        }
    });
});
numDaysAPITimes = 0;

}

Answer 1

$.when不接受數組作為輸入

由於您傳遞的數組本身並不是一個承諾，因此它可能會立即觸發，因此在所有ajax調用完成之前

需要更改為

$.when.apply(null, JSONAPIS).done...