从关联数组中删除值[重复]

Possible Duplicate:
Remove specific element from a javascript array?

可能重复：从javascript数组中删除特定元素？

I am having an array, from which I want to remove a value.

我有一个数组，我想从中删除一个值。

Consider this as an array

将此视为一个数组

[ 'utils': [ 'util1', 'util2' ] ]

['utils'：['util1'，'util2']]

Now I just want to remove util2. How can I do that, I tried using delete but it didn't work.

现在我只想删除util2。我怎么能这样做，我尝试使用删除但它没有用。

Can anyone help me?

谁能帮我？

3 个解决方案

#1

Use the splice method:

使用拼接方法：

var object = { 'utils': [ 'util1', 'util2' ] }

object.utils.splice(1, 1);

If you don't know the actual position of the array element, you'd need to iterate over the array and splice the element from there. Try the following method:

如果您不知道数组元素的实际位置，则需要迭代数组并从那里拼接元素。尝试以下方法：

for (var i = object.utils.length; i--;) {
    var index = object.utils.indexOf('util2');

    if (index === -1) break;

    if (i === index) {
        object.utils.splice(i, 1); break;
    }
}

Update: techfoobar's answer seems to be more idiomatic than mine. Consider using his instead.

更新：techfoobar的答案似乎比我的更为惯用。考虑使用他而不是。

#2

You can use Array.splice() in combo with Array.indexOf() to get the desired behavior without having to loop through the array:

您可以在Array.indexOf（）的组合中使用Array.splice（）来获得所需的行为，而无需遍历数组：

var toDelete = object.utils.indexOf('util1');
if(toDelete != -1) {
    object.utils.splice(toDelete, 1);
}

#3

I think there is no such thing called associative array in Javascript. It is actually an object.

我认为在Javascript中没有称为关联数组的东西。它实际上是一个对象。

[ 'utils': [ 'util1', 'util2' ] ]

For this line, I don't think it would compile. You should write this instead.

对于这一行，我认为它不会编译。你应该写这个。

var obj = { 'utils': [ 'util1', 'util2' ] }

So to remove the element "util2" in the array (the inside array), there are 2 ways.

因此，要删除数组中的元素“util2”（内部数组），有两种方法。

use pop()

使用pop（）

obj["utils"].pop(); // obj["utils"] is used to access the "property" of the object, not an element in associative array

reduce the length

缩短长度
```
obj["utils"].length --;
```

#1