javascript - JS 中迭代对象数组和键值

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 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，那么我会从数组中删除该对象。我不确定如何迭代数组中对象的键。

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
        }

    }
}

编辑

更简洁:

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

    }