Javascript 如何在Angular 2中检索数组的最后一个元素ID
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How to retrieve last element id of array in Angular 2
提问by S.Yadav
I am trying to get id of last element of my array.
我正在尝试获取数组最后一个元素的 id。
This is how I am fetching last element of my array
这就是我获取数组最后一个元素的方式
let last = this.Array[this.Array.length-1];
console.log(last);
Here is the console of last element of array-
这是数组最后一个元素的控制台-
Object {id: 48, title: "I'm used to this"}
title: "I'm used to this"
id: 48
__proto__: Object
Here is the list on which I have looked already-
这是我已经看过的清单-
How to retrieve the clicked ElementId in angularjs?
How to get the object's id?
how to get the id name in html for any objectand many more but I could not.
如何在angularjs中检索点击的ElementId？
如何获取对象的id？
如何在 html 中获取任何对象的 id 名称等等，但我不能。
I just wanted to access id : 48, can any one help me to do so.
Thanks In Advance.
我只是想访问id : 48，任何人都可以帮助我这样做。
提前致谢。
回答by Duannx
Just do that:
就这样做：
let last:any = this.Array[this.Array.length-1];
console.log(last.id);
回答by anoop
You can do this.Array.slice(-1)[0].id, and with sliceyour original array is not changed too.
你可以做this.Array.slice(-1)[0].id，并且slice你的原始数组也没有改变。
DEMO :
演示：
var array = [{
id: 43,
title: "I'm used to this"
},{
id: 44,
title: "I'm used to this"
},{
id: 45,
title: "I'm used to this"
},{
id: 46,
title: "I'm used to this"
},{
id: 47,
title: "I'm used to this"
},{
id: 48,
title: "I'm used to this"
}]
console.log('last id : ' + this.array.slice(-1)[0].id)Update:
更新：
As your Array item is type of Object, So first convert it to some real class\interfacetype, Something like:
由于您的 Array 项的类型为Object，因此首先将其转换为某种真实class\interface类型，例如：
export interface arrayItem{
id?: number;
title?: string;
}
then define your array type, like :
然后定义您的数组类型，例如：
your Array like
你的数组喜欢
this.Array : Array<arrayItem> = [ {
id: 48,
title: "I'm used to this"
},
//your other array items
]
