在javascript中通过引用删除数组的项目?

时间:2015-09-05 09:34:41

标签: javascript arrays object

我有一个javascript对象如下:

obj = {
   a: 'a',
   b: 'b',
}

我将obj添加到数组中,如下所示:

arr = [];
arr.push(obj);

现在我要删除arr[0]。我只能访问obj,但我想删除obj,然后自动删除arr[0]

我该怎么做,或者有可能吗?

3 个答案:

答案 0 :(得分:1)

保存插入对象的索引:

arr.push(obj);
var index = arr.length - 1;

然后使用保存的索引向对象添加一个方法以将其从数组中删除:

obj.remove = function () {
    delete arr[index];
};

然后,代码中arr超出范围的其他地方,只需执行

obj.remove();

注意:这将在您的对象所在的位置在数组中留下一个洞,它不会重新组织数组,左右移动元素以填充孔。如果您不想留下漏洞,请不要使用数组,而应使用链接列表。

答案 1 :(得分:1)

您可以将列表附加到对象本身,然后以这种方式访问​​列表以删除对象?这有点乱,理想情况下,您可以找到重组代码的方法,但是这些事情发生了!所以这可能会有所帮助:

http://jsfiddle.net/dk79mb3x/1/

// This function, and returning the obj, is not strictly 
// necessary. I am doing it to achieve a state where the obj is 
// in scope, but the list is not.
function defineStuff() {
    var list = [];
    var obj = {
        a: 'a',
        b: 'b',
        // These two are the useful bits!
        container: list,
        index: list.length

        // We can only delete this once, if you try a second time, the
        // index will be incorrect!
        deleted: false;
    };
    list.push(obj);
    return obj;
}

obj = defineStuff();

// Note that the list is no longer in scope
console.log(typeof list);

// But we know it has one item in it... this should log '1'
console.log(obj.container.length);

// Now we can delete via the object like this...
if (!obj.deleted)
    obj.container.splice(obj.index, 1);
// (You could work around this index issue and remove the .deleted flag by
// instead searching the list for something that matches the object. If you
// have an object.key, for example, that would work well.)

// Is it now empty? This should log '0'
console.log(obj.container.length);

答案 2 :(得分:0)

这是不可能的。您必须访问arr,然后使用delete arr[0]