Question

我有一个对象数组

var j = [{"v1":["1","2","3"]}, {"v2":["4","5","6"]}, {"v3":["7","8","9"]}];

我想检查对象属性并执行某种逻辑。我是JS的新手，所以我不确定我可以访问的所有方法。基本上我想将对象的键值与字符串进行比较。如果键和字符串相同，那么我将从数组中删除该对象。我不确定如何遍历数组中对象的键。

var str = "v1";
for (var i in j) {
  if (i.key == str) {     // not sure how to access key value
    j.splice(i,1);
  }
}

Answer 1

试试这个：

var  j = [{"v1":["1","2","3"]}, {"v2":["4","5","6"]}, {"v3":["7","8","9"]}];

for (var i = 0; i < j.length; i++)
{
    for (var k in j[i]) //do use this if you need to iterate
    {
        if (k === "mySomething")
        {
            //...do your stuff
        }

    }
}

修改

少详细：

for (var i = 0; i < j.length; i++) { if ("mySomething" in j[i]) { //...do your stuff } }

Answer 2

正如我们在评论中讨论的那样，很少有理由使用每个只有一个属性的对象数组（除非你使用数组来维护特定的顺序），所以我想也许你的问题如果数据结构如下可能会更容易：

var j = {"v1":["1","2","3"], "v2":["4","5","6"], "v3":["7","8","9"]};

然后，您可以像这样迭代它：

for (var key in j) {
    console.log("j[" + key + "] = ", j[key]);
}

工作演示：http://jsfiddle.net/jfriend00/qdgzso1g/

迭代JS中的对象数组和键值

2 个答案: