Question

使用航班数据API构建网络应用程序，而且，斗争是真实的。

我返回的数组和它的对象看起来像这样：

results:

0:{destination: "YTO", 
departure_date: "2018-01-24", 
return_date: "2018-01-25"
airline: "TS"}

1:{destination: "BOS", 
departure_date: "2018-01-08", 
return_date: "2018-01-11",
airline: "AC"}

2:{destination: "SJU", 
departure_date: "2018-01-31", 
return_date: "2018-02-01", 
airline: "AA"}

在我将结果转储到DOM中以显示给站点的访问者之前，我需要通过额外的API（长篇故事）运行某些返回值，所以我显然需要以某种方式隔离它们。

对于这个例子，我正在使用目的地，所以我的初始思考过程首先要注销：

console.log(response.results[0].destination);

我们知道将在FIRST对象中打印FIRST目的地，因为[0]是该对象的索引（因此在这种情况下，我们返回YTO）。

由于每个返回的对象都有一个索引号，我想我需要循环遍历它们（对于每个？）来提取我需要的值，但我正在尝试不带运气的变化.....或者所有我知道这完全是另一回事。

（你的两分钱在这里）

Answer 1

forEach适用于数组。尝试使用for循环

> dput(dat[1:20])
structure(list(tme = structure(c(1512489600, 1512493200, 1512496800, 
1512500400, 1512504000, 1512507600, 1512511200, 1512514800, 1512518400, 
1512522000, 1512525600, 1512529200, 1512532800, 1512536400, 1512540000, 
1512543600, 1512547200, 1512550800, 1512554400, 1512558000), class = c("POSIXct", 
"POSIXt"), tzone = "America/Chicago"), degc = c(24, 21, 21, 19, 
18, 17, 16, 15, 14, 14, 13, 12, 12, 12, 11, 11, 10, 10, 9, 9), 
    rh = c(89, 87, 88, 82, 81, 79, 76, 80, 80, 80, 78, 75, 71, 
    68, 67, 68, 71, 76, 78, 80), type = c("forecast_1", "forecast_1", 
    "forecast_1", "forecast_1", "forecast_1", "forecast_1", "forecast_1", 
    "forecast_1", "forecast_1", "forecast_1", "forecast_1", "forecast_1", 
    "forecast_1", "forecast_1", "forecast_1", "forecast_1", "forecast_1", 
    "forecast_1", "forecast_1", "forecast_1"), pres = c(NA_real_, 
    NA_real_, NA_real_, NA_real_, NA_real_, NA_real_, NA_real_, 
    NA_real_, NA_real_, NA_real_, NA_real_, NA_real_, NA_real_, 
    NA_real_, NA_real_, NA_real_, NA_real_, NA_real_, NA_real_, 
    NA_real_), prec = c(NA_real_, NA_real_, NA_real_, NA_real_, 
    NA_real_, NA_real_, NA_real_, NA_real_, NA_real_, NA_real_, 
    NA_real_, NA_real_, NA_real_, NA_real_, NA_real_, NA_real_, 
    NA_real_, NA_real_, NA_real_, NA_real_)), .Names = c("tme", 
"degc", "rh", "type", "pres", "prec"), class = c("data.table", 
"data.frame"), row.names = c(NA, -20L), .internal.selfref = <pointer: 0x00000000000b0788>)

Answer 2

您可以使用Object方法将Object.keys()的键转换为数组，这样您就可以使用Array.forEach()方法遍历Object的可枚举属性，就像这样...

Object.keys(dataObj).forEach(function(k) {
    var dest = dataObj[k].destination;
    /* ... etc ... */
});

希望有所帮助。

更多关于Object.keys() @MDN

API - 隔离索引对象

2 个答案: