【发布时间】：2021-11-04 08:49:33
【问题描述】：
我需要映射从我的 API 返回的该数组中的特定数据，并将其列出到由 jQuery 创建的表中。但是，我只需要显示这个数组中的特定数据，而不是整个数据。下面列出了数组，返回的数据量相当大。我只需要映射数据：“raw_value”：[]，然后从那里我只需要最后 10 个数据点，所以在这种情况下，我需要从数据点 2850 开始。我知道如何映射整个数组，但我不确定如何从特定值开始。非常感谢任何建议！
这是我用来访问 API 的 ajax 调用。数据被存储在响应中，然后被解析。然后我尝试在最后通过解析的 obj 进行映射。
const modelApi = function () {
$.ajax({
url: `api_url`,
method: 'GET',
error: function (xhr) {
if (xhr.status === 504) {
modelApi()
$('.overlayMessage').text('Server not responding, trying your search again. Please do not refresh the page')
}
if (xhr.status === 502) {
$('#overlay').fadeOut()
alert('No data was returned for your current search criteria. Please try selecting a different meter or a different date range')
}
}
}).then(response => {
const obj = JSON.parse(response.body)
console.log(obj)
obj.map(data, () => {
})
{
"building": {
"building_abbreviation": "ECJ",
"building_number": "0227",
"use_type": "Laboratory",
"aliases": null,
"is_dorm": 0,
"cooling_commodity": "CHW",
"heating_commodity": "STM"
},
"meter": "2032",
"commodity": {
"tag": "S"
},
"model": {
"x": "hdd",
"train_start": "2019-05-01",
"train_end": "2020-04-29",
"analysis_start": "2020-05-01",
"analysis_end": "2020-05-31",
"iqr_errors": [
{
"lower_bound": -6684.776494485483,
"upper_bound": 7416.929568407427
}
],
"auto_ignored_percentage": 20.454545454545453,
"search": {
"base_temperatures": [
10,
11,
12,
13,
14,
15,
16,
17,
18,
19,
],
"r2_scores": [
0,
0,
0,
0,
0,
0,
0,
0,
]
},
"base_temperature": 84,
"max_train_r2": 0.4810672409755815,
"slope": 474.72313695289665,
"intercept": 3058.7897948225855,
"std": {
"analysis": 2126.1299232079455,
"train": 6244.513670227164
},
"data": {
"timestamp": [
"2019-05-01",
"2019-05-02",
"2019-05-03",
"2019-05-04",
"2019-05-05",
"2019-05-06",
"2019-05-07",
"2019-05-08",
"2019-05-09",
"2019-05-10",
],
"average_dry_bulb_temperature": [
77.9,
69.4,
68.7,
71.1,
73.8,
71.8,
74.7,
71.8,
75.9,
60.8,
60.6,
68.9,
70.5,
73.2,
75.2,
76.5,
79.3,
79.2,
82.9,
81.3,
78.3,
82.2,
],
"degree_day": [
6.099999999999994,
14.599999999999994,
15.299999999999997,
12.900000000000006,
10.200000000000003,
12.200000000000003,
9.299999999999997,
12.200000000000003,
8.099999999999994,
23.200000000000003,
23.4,
15.099999999999994,
13.5,
10.799999999999997,
8.799999999999997,
7.5,
4.700000000000003,
4.799999999999997,
1.0999999999999943,
2.700000000000003,
5.700000000000003,
1.7999999999999972,
1.4000000000000057,
2.0999999999999943,
3.200000000000003,
3,
4.099999999999994,
4.099999999999994,
1.5999999999999943,
6.599999999999994,
3,
1.2000000000000028,
],
"raw_value": [
1420,
3920,
8170,
8270,
7170,
3230,
2900,
5140,
6060,
4970,
15260,
15780,
5030,
4800,
5900,
5660,
5420,
4720,
4740,
4550,
4490,
4710,
1960,
770,
1970,
4020,
4630,
4600,
4180,
2930,
2490,
4090,
4580,
3160,
1680,
3460,
4730,
5160,
2140,
2570,
4060,
2860,
3280,
1230,
470,
1000,
3370,
4380,
4490,
4480,
3960,
1730,
1730,
4820,
4970,
2720,
3430,
4540,
4970,
3320,
1270,
2280,
3660,
4160,
3670,
2520,
3820,
3810,
3440,
3230,
2050,
3640,
2950,
2900,
3110,
930,
530,
330,
2290,
3810,
3940,
3820,
2060,
2880,
3820,
3940,
3940,
1990,
3880,
3850,
3780,
3040,
3570,
2870,
3030,
3260,
2850,
3410,
1650,
3790,
3760,
2850,
3170,
2540,
3440,
3320,
],
"preprocessed_value": [
1420,
3920,
8170,
8270,
7170,
3230,
2900,
5140,
6060,
null,
15260,
15780,
5030,
4800,
5900,
5660,
5420,
4720,
4740,
4550,
4490,
4710,
1960,
770,
1970,
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4630,
4600,
4180,
2930,
2490,
4090,
4580,
3160,
1680,
3460,
4730,
5160,
2140,
2570,
4060,
2860,
3280,
1230,
470,
1000,
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4380,
4490,
4480,
3960,
1730,
1730,
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1270,
2280,
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4160,
3670,
2520,
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3230,
2050,
3640,
2950,
2900,
3110,
930,
530,
330,
2290,
3810,
3940,
3820,
2060,
2880,
3820,
3940,
3940,
1990,
3880,
3850,
3780,
3040,
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4000,
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3630,
3020,
3360,
3160,
3410,
3260,
3140,
3650,
3700,
3810,
3820,
],
"null_reason": [
null,
null,
null,
null,
null,
null,
null,
null,
null,
"IQR boundary error",
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
],
"predicted_value": [
5954.600930235252,
9989.747594334873,
10322.053790201902,
9182.718261514954,
7900.965791742133,
8850.412065647926,
7473.714968484523,
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6904.047204141046,
14072.36657212979,
14167.311199520367,
10227.10916281132,
9467.552143686691,
8185.799673913868,
7236.3534000080745,
6619.2133219693105,
5289.988538501201,
5337.460852196487,
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3913.291441337798,
3723.4021865566438,
4055.7083824236656,
4577.903833071856,
4482.959205681275,
5005.154656329459,
5005.154656329459,
3818.3468139472175,
6191.9624987117,
4482.959205681275,
3628.4575591660628,
3296.1513632990336,
3296.1513632990336,
5764.7116754540975,
5005.154656329459,
6286.907126102282,
3818.3468139472175,
3201.206735908453,
3201.206735908453,
5289.988538501201,
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6191.9624987117,
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4435.486891985988,
3153.734422213166,
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5289.988538501201,
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3913.291441337798,
3580.985245470769,
7331.298027398655,
4055.7083824236656,
4008.236068728379,
5100.099283720039,
],
"predicted_value_lower_bound": [
-6534.4264102190755,
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"predicted_value_upper_bound": [
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]
}
}
}
【问题讨论】：
-
要么获取该数组的长度，然后编写一个具有匹配开始和结束条件的
for循环，或者使用Array.slice先提取数组中想要的部分，然后进行迭代在那个... -
切片选项对我有用。谢谢！
标签： javascript jquery arrays