Javascript 散列键/值作为数组
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hash keys / values as array
提问by greg0ire
I cannot find the javascript equivalent of php array_keys()/ array_values()
我找不到相当于 php array_keys()/的 javascriptarray_values()
For people unfamiliar with php given the following js hash:
对于不熟悉 php 的人，给出以下 js 哈希：
var myHash = {"apples": 3, "oranges": 4, "bananas": 42}
How can I get an array of keys, i.e.
我怎样才能得到一组键，即
["apples", "oranges", "bananas"]
Same question with the values, i.e.
与值相同的问题，即
[3, 4, 42]
jQuery can be used.
可以使用jQuery。
采纳答案by Imp
var a = {"apples": 3, "oranges": 4, "bananas": 42};
var array_keys = new Array();
var array_values = new Array();
for (var key in a) {
array_keys.push(key);
array_values.push(a[key]);
}
alert(array_keys);
alert(array_values);
回答by
In ES5 supported (or shimmed)browsers...
在 ES5 支持（或填充）的浏览器中......
var keys = Object.keys(myHash);
var values = keys.map(function(v) { return myHash[v]; });
Shims from MDN...
来自 MDN 的垫片...
回答by Literal
The second answer (at the time of writing) gives :
第二个答案（在撰写本文时）给出：
var values = keys.map(function(v) { return myHash[v]; });
But I prefer using jQuery's own $.map:
但我更喜欢使用 jQuery 自己的$.map：
var values = $.map(myHash, function(v) { return v; });
Since jQuery takes care of cross-browser compatibility. Plus it's shorter :)
由于 jQuery 负责跨浏览器兼容性。另外它更短:)
At any rate, I always try to be as functional as possible. One-liners are nicers than loops.
无论如何，我总是尽可能地发挥作用。单线比循环更好。
回答by Josh Petitt
look at the _.keys() and _.values() functions in either lodash or underscore
在 lodash 或下划线中查看 _.keys() 和 _.values() 函数
回答by Abid
function getKeys(obj){
var keys = [];
for (key in obj) {
if (obj.hasOwnProperty(key)) { keys[keys.length] = key; }
}
return keys;
}
回答by Igor Deruga
Don't know if it helps, but the "foreach" goes through all the keys: for (var key in obj1) {...}
不知道它是否有帮助，但“foreach”遍历所有键： for (var key in obj1) {...}
回答by Surreal Dreams
Here are implementations from phpjs.org:
以下是来自phpjs.org 的实现：
This is notmy code, I'm just pointing you to a useful resource.
这不是我的代码，我只是给你指出一个有用的资源。
回答by test30
var myHash = {"apples": 3, "oranges": 4, "bananas": 42}
vals=(function(e){a=[];for (var i in e) a.push(e[i]); return a;})(myHash).join(',')
keys=(function(e){a=[];for (var i in e) a.push( i ); return a;})(myHash).join(',')
console.log(vals,keys)
basically
基本上
array=(function(e){a=[];for (var i in e) a.push(e[i]); return a;})(HASHHERE)
回答by VisioN
Here is a good example of array_keysfrom PHP.js library:
这是array_keys来自PHP.js 库的一个很好的例子：
function array_keys (input, search_value, argStrict) {
// Return just the keys from the input array, optionally only for the specified search_value
var search = typeof search_value !== 'undefined',
tmp_arr = [],
strict = !!argStrict,
include = true,
key = '';
for (key in input) {
if (input.hasOwnProperty(key)) {
include = true;
if (search) {
if (strict && input[key] !== search_value) {
include = false;
}
else if (input[key] != search_value) {
include = false;
}
}
if (include) {
tmp_arr[tmp_arr.length] = key;
}
}
}
return tmp_arr;
}
The same goes for array_values(from the same PHP.js library):
这同样适用于array_values（从同一PHP.js库）：
function array_values (input) {
// Return just the values from the input array
var tmp_arr = [],
key = '';
for (key in input) {
tmp_arr[tmp_arr.length] = input[key];
}
return tmp_arr;
}
EDIT:Removed unnecessary clauses from the code.
编辑：从代码中删除了不必要的子句。
