查找具有下划线中特定键值的对象的数组索引 [英] find the array index of an object with a specific key value in underscore

问题描述

在下划线中，我可以成功找到具有特定键值的项目

In underscore, I can successfully find an item with a specific key value

var tv = [{id:1},{id:2}]
var voteID = 2;
var data = _.find(tv, function(voteItem){ return voteItem.id == voteID; });
//data = { id: 2 }

但我如何找到什么数组索引该对象发生在？

but how do I find what array index that object occurred at?

推荐答案

我不知道是否存在执行此操作的现有下划线方法，但您可以实现与普通javascript相同的结果。

I don't know if there is an existing underscore method that does this, but you can achieve the same result with plain javascript.

Array.prototype.getIndexBy = function (name, value) {
    for (var i = 0; i < this.length; i++) {
        if (this[i][name] == value) {
            return i;
        }
    }
    return -1;
}

然后你可以这样做：

var data = tv [tv.getIndexBy（id，2）]

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