Question

我需要创建一个带有特定键的数组或js对象，这些键应该被推送到空数组或js对象。之后，我需要根据这些键推送一些特定的值，如下所示：

var arr = ["john":["jval1","jval2"], "matt":["mval1","mval2","mval3"]]

我知道这不是js对象或数组的严格标记，但这就是主意。

这基本上就是我要做的事情：

var keys = ["john","matt"];             //my keys
var jvals = ["jval1","jval2"];          //my values for key john
var mvals = ["mval1","mval2","mval3"];  //my values for key matt

var arr = [];

for(var i in keys) arr.push(keys[i])  //pushing the names (I need to push this names as keys so next lines should work)

for(var i in jvals) arr["john"].push(jvals[i])  //Trying to push john values, which doesn't work because "john is not a key"
for(var i in mvals) arr["matt"].push(mvals[i])  //Same.

这根本不起作用，所以我该怎么做？

Answer 1

以下是代码的更短版本，使用 forEach

var keys = ["john","matt"];             //my keys
var jvals = ["jval1","jval2"];          //my values for key john
var mvals = ["mval1","mval2","mval3"];  //my values for key matt
var object = {}
  keys.forEach(function(key, index) {
    object[key] = index == 0 ? jvals.slice() : mvals.slice()
  });
console.log(object)

Answer 2

这是你想要的吗？

将arr声明为对象并使用空数组添加键。然后按下您的键。

＆＃13;

var keys = ["john","matt"];             //my keys
var jvals = ["jval1","jval2"];          //my values for key john
var mvals = ["mval1","mval2","mval3"];  //my values for key matt

var arr = {};

for(var i in keys) arr[keys[i]]=[];

for(var i in jvals) arr["john"].push(jvals[i]);  
for(var i in mvals) arr["matt"].push(mvals[i]);

console.log(arr);

＆＃13;

Answer 3

var keys = ["john","matt"];             //my keys
var jvals = ["jval1","jval2"];          //my values for key john
var mvals = ["mval1","mval2","mval3"];  //my values for key matt

var arr = {}; // not []

for(var i in keys) arr.[keys[i]] = [];  //pushing the names (I need to push this names as keys so next lines should work)

for(var i in jvals) arr["john"].push(jvals[i])  //Trying to push john values, which doesn't work because "john is not a key"
for(var i in mvals) arr["matt"].push(mvals[i])  //Same.

Answer 4

好的，我知道您正在尝试做什么。代码的第一个问题是将arr的值压入其中之后，如何对keys数组进行处理：

for(...) {
    arr["john"].push(jvals[i]);
}

您正在做的几乎是说arr.john.push(...)，但是arr没有名为john的数组属性。 arr所具有的是索引0处的元素，其值为"john"。即arr看起来很像arr = ["john", "matt"]。

现在您要做的就是将arr更改为对象而不是数组。

这样，您的代码将如下所示：

var keys = ["john","matt"];
var jvals = ["jval1","jval2"];
var mvals = ["mval1","mval2","mval3"];

var arr = {};

arr["john"] = jvals;
arr["matt"] = mvals;

// Please don't do the above

// Doing the following (using an object literal) is much better, and what most will advice when creating objects in js.

var arr = {
    john: ["jval1","jval2"],
    matt: ["mval1","mval2","mval3"]
};

将键推送到数组或javascript对象？

4 个答案: