Javascript 删除数组的第一项（如从堆栈中弹出）
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Remove first Item of the array (like popping from stack)
提问by Raihan
I have list of items created via ng-repeat. I also have Delete button.
Clicking delete button removes last item of the array one by one. Plunker
我有通过ng-repeat. 我也有删除按钮。点击删除按钮将数组的最后一项一项一项删除。普朗克
But I want to remove items one by one starting from the first item. How can I do that? I used this for removing list Items:
但我想从第一个项目开始一个一个地删除项目。我怎样才能做到这一点？我用它来删除列表项：
$scope.index = 1;
$scope.remove = function(item) {
var index = $scope.cards.indexOf(item);
$scope.cards.splice(index, 1);
}
Is there any way I can remove from the top?
有什么办法可以从顶部删除吗？
回答by Thalsan
The easiest way is using shift(). If you have an array, the shiftfunction shifts everything to the left.
最简单的方法是使用shift(). 如果您有一个数组，该shift函数会将所有内容向左移动。
var arr = [1, 2, 3, 4];
var theRemovedElement = arr.shift(); // theRemovedElement == 1
console.log(arr); // [2, 3, 4]
回答by Muhammad Danial Iqbal
Just use arr.slice(startingIndex, endingIndex).
只需使用arr.slice(startingIndex, endingIndex).
If you do not specify the endingIndex, it returns all the items starting from the index provided.
如果未指定endingIndex，则返回从提供的索引开始的所有项目。
In your case arr=arr.slice(1).
在你的情况下arr=arr.slice(1)。
回答by Jo VdB
const a = [1, 2, 3]; // -> [2, 3]
// Mutable solutions: update array 'a', 'c' will contain the removed item
const c = a.shift(); // prefered mutable way
const [c] = a.splice(0, 1);
// Immutable solutions: create new array 'b' and leave array 'a' untouched
const b = a.slice(1); // prefered immutable way
const b = a.filter((_, i) => i > 0);
const [c, ...b] = a; // c: the removed item
回答by Kushal
回答by Hazarapet Tunanyan
There is a function called shift().
It will remove the first element of your array.
有一个函数叫做shift(). 它将删除数组的第一个元素。
There is some good documentation and examples.
有一些很好的文档和示例。
