连接对象值

Question

我有一个 JavaScript 对象，我确定任何键的值都是一个数组（在某些情况下甚至是空的）：

{key1:["a","b","c"],key2:["d","e","f"],key3:...}

除了使用 Underscore 之外，还有什么方法可以连接此对象的所有值（并创建一个新数组）？

目前我使用 Object.keys 获取键名，然后循环并连接。

感谢任何帮助。

Answer 1

检查array concat函数

var obj = {key1:["a","b","c"],key2:["d","e","f"],key3:["g","h"]};

var resultArray = [];
for (var key in obj) resultArray = resultArray.concat(obj[key]);

alert(resultArray);

jsfiddle:

http://jsfiddle.net/qpLq11ea/

Answer 2

试试这个： http://jsfiddle.net/6hbp5bzo/

var arr= [];
var o={key1:["a","b","c"],key2:["d","e","f"]}
for(key in o){
  if(o.hasOwnProperty(key)){
    arr.push(o[key]);
}
}
alert(arr);

Answer 3

var obj = {key1:["a","b","c"],key2:["d","e","f"]};

var arr = Object.keys(obj).reduce(function(res, v) {
    return res.concat(obj[v]);
}, []);

// ["a", "b", "c", "d", "e", "f"]

Answer 4

一种简单的方法是使用 Object.values() and concatenate 和 [].concat.apply() 以这种方式获取值：

const _obj = { key1:["a","b","c"], key2:["d","e","f"], key3:["g","h","i"] }

const _arr = [].concat.apply([], Object.values(_obj))

console.log(_arr)

---

另一种类似的方式，是合并 Object.values() by spreading them into Array.concat() 像这样：

const _obj = { key1:["a","b","c"], key2:["d","e","f"], key3:["g","h","i"] }

const _arr = [].concat(...Object.values(_obj))

console.log(_arr)

---

也减少 Object.values() and concatenate 它们的每个值，你可以得到相同的结果：

const _obj = { key1:["a","b","c"], key2:["d","e","f"], key3:["g","h","i"] }

const _arr = Object.values(_obj).reduce((r,c) => r.concat(c), [])

console.log(_arr)

---

要完成，您也可以使用Array.prototype.flat() over each value of the Object.values()。请记住：并非所有浏览器都支持它。

const _obj = { key1:["a","b","c"], key2:["d","e","f"], key3:["g","h","i"] }

const _arr = Object.values(_obj).flat()

console.log(_arr)

希望这些方法可以帮助到外面的人:)