如何从数组中删除一个特定值? 类似 :
array.remove(value);
我必须使用核心核心核心JavaScript。 不允许框架 。
如何从数组中删除一个特定值? 类似 :
array.remove(value);
我必须使用核心核心核心JavaScript。 不允许框架 。
当前回答
约翰·里维格( John Resig)已张贴良好执行情况:
// Array Remove - By John Resig (MIT Licensed)
Array.prototype.remove = function(from, to) {
var rest = this.slice((to || from) + 1 || this.length);
this.length = from < 0 ? this.length + from : from;
return this.push.apply(this, rest);
};
如果您不想扩展一个全球对象, 可以做一些类似的东西,
// Array Remove - By John Resig (MIT Licensed)
Array.remove = function(array, from, to) {
var rest = array.slice((to || from) + 1 || array.length);
array.length = from < 0 ? array.length + from : from;
return array.push.apply(array, rest);
};
但我之所以张贴这篇文章,主要是为了提醒用户不要采取该页(2007年12月14日)评论中建议的其他实施方式:
Array.prototype.remove = function(from, to) {
this.splice(from, (to=[0, from || 1, ++to - from][arguments.length]) < 0 ? this.length + to : to);
return this.length;
};
它一开始似乎效果良好,但经过一个痛苦的过程,我发现它在试图删除数组中第二至最后一个元素时失败了。例如,如果您有一个 10 元素数组,并且试图用这个来删除第九元素:
myArray.remove(8);
我不知道为什么 但我确认约翰的原创执行没有问题
其他回答
我喜欢这个单行道:
arr.includes(val) && arr.splice(arr.indexOf(val), 1)
null
或undefined
作为原型
// remove by value. return true if value found and removed, false otherwise
Array.prototype.remove = function(val)
{
return this.includes(val) && !!this.splice(this.indexOf(val), 1);
}
(是的,我读了所有其他的答案 却找不到一个结合的答案)includes
和splice
在同一行中。 )
使用 JavaScript 原型特性定义列对象上名为删除() 的方法 。
使用使用复数()满足要求的方法。
请看看下面的代码
Array.prototype.remove = function(item) {
// 'index' will have -1 if 'item' does not exist,
// else it will have the index of the first item found in the array
var index = this.indexOf(item);
if (index > -1) {
// The splice() method is used to add/remove items(s) in the array
this.splice(index, 1);
}
return index;
}
var arr = [ 11, 22, 67, 45, 61, 89, 34, 12, 7, 8, 3, -1, -4];
// Printing array
// [ 11, 22, 67, 45, 61, 89, 34, 12, 7, 8, 3, -1, -4];
console.log(arr)
// Removing 67 (getting its index, i.e. 2)
console.log("Removing 67")
var index = arr.remove(67)
if (index > 0){
console.log("Item 67 found at ", index)
} else {
console.log("Item 67 does not exist in array")
}
// Printing updated array
// [ 11, 22, 45, 61, 89, 34, 12, 7, 8, 3, -1, -4];
console.log(arr)
// ............... Output ................................
// [ 11, 22, 67, 45, 61, 89, 34, 12, 7, 8, 3, -1, -4 ]
// Removing 67
// Item 67 found at 2
// [ 11, 22, 45, 61, 89, 34, 12, 7, 8, 3, -1, -4 ]
注:下面是用完整示例代码执行的完整示例代码。REPL编号js REPL来描述推 ()、 流行 ()、 转移 ()、 非转移 () 和 组合 () 方法的使用 。
> // Defining an array
undefined
> var arr = [12, 45, 67, 89, 34, 12, 7, 8, 3, -1, -4, -11, 0, 56, 12, 34];
undefined
> // Getting length of array
undefined
> arr.length;
16
> // Adding 1 more item at the end i.e. pushing an item
undefined
> arr.push(55);
17
> arr
[ 12, 45, 67, 89, 34, 12, 7, 8, 3, -1, -4, -11, 0, 56, 12, 34, 55 ]
> // Popping item from array (i.e. from end)
undefined
> arr.pop()
55
> arr
[ 12, 45, 67, 89, 34, 12, 7, 8, 3, -1, -4, -11, 0, 56, 12, 34 ]
> // Remove item from beginning
undefined
> arr.shift()
12
> arr
[ 45, 67, 89, 34, 12, 7, 8, 3, -1, -4, -11, 0, 56, 12, 34 ]
> // Add item(s) at beginning
undefined
> arr.unshift(67); // Add 67 at beginning of the array and return number of items in updated/new array
16
> arr
[ 67, 45, 67, 89, 34, 12, 7, 8, 3, -1, -4, -11, 0, 56, 12, 34 ]
> arr.unshift(11, 22); // Adding 2 more items at the beginning of array
18
> arr
[ 11, 22, 67, 45, 67, 89, 34, 12, 7, 8, 3, -1, -4, -11, 0, 56, 12, 34 ]
>
> // Define a method on array (temporarily) to remove an item and return the index of removed item; if it is found else return -1
undefined
> Array.prototype.remove = function(item) {
... var index = this.indexOf(item);
... if (index > -1) {
..... this.splice(index, 1); // splice() method is used to add/remove items in array
..... }
... return index;
... }
[Function]
>
> arr
[ 11, 22, 67, 45, 67, 89, 34, 12, 7, 8, 3, -1, -4, -11, 0, 56, 12, 34 ]
>
> arr.remove(45); // Remove 45 (you will get the index of removed item)
3
> arr
[ 11, 22, 67, 67, 89, 34, 12, 7, 8, 3, -1, -4, -11, 0, 56, 12, 34 ]
>
> arr.remove(22) // Remove 22
1
> arr
[ 11, 67, 67, 89, 34, 12, 7, 8, 3, -1, -4, -11, 0, 56, 12, 34 ]
> arr.remove(67) // Remove 67
1
> arr
[ 11, 67, 89, 34, 12, 7, 8, 3, -1, -4, -11, 0, 56, 12, 34 ]
>
> arr.remove(89) // Remove 89
2
> arr
[ 11, 67, 34, 12, 7, 8, 3, -1, -4, -11, 0, 56, 12, 34 ]
>
> arr.remove(100); // 100 doesn't exist, remove() will return -1
-1
>
我对基底 JavaScript 阵列进行了相当高效的扩展:
Array.prototype.drop = function(k) {
var valueIndex = this.indexOf(k);
while(valueIndex > -1) {
this.removeAt(valueIndex);
valueIndex = this.indexOf(k);
}
};
您在数组中有 1 到 9 个, 您想要删除 5 个 。 请使用以下代码 :
var numberArray = [1, 2, 3, 4, 5, 6, 7, 8, 9];
var newNumberArray = numberArray.filter(m => {
return m !== 5;
});
console.log("new Array, 5 removed", newNumberArray);
如果您想要多个值。例如:- 1,7,8
var numberArray = [1, 2, 3, 4, 5, 6, 7, 8, 9];
var newNumberArray = numberArray.filter(m => {
return (m !== 1) && (m !== 7) && (m !== 8);
});
console.log("new Array, 1,7 and 8 removed", newNumberArray);
如果您想要删除数组中的数组值。 例如 : [3,4,5]
var numberArray = [1, 2, 3, 4, 5, 6, 7, 8, 9];
var removebleArray = [3,4,5];
var newNumberArray = numberArray.filter(m => {
return !removebleArray.includes(m);
});
console.log("new Array, [3,4,5] removed", newNumberArray);
包括支持的浏览器链接链接.
Vanilla JavaScript(ES5.1) - (ES5.1) -已经到位版本版本
浏览器支持 :因特网探索者 9或以后(或以后(详细浏览器支持)
/**
* Removes all occurences of the item from the array.
*
* Modifies the array “in place”, i.e. the array passed as an argument
* is modified as opposed to creating a new array. Also returns the modified
* array for your convenience.
*/
function removeInPlace(array, item) {
var foundIndex, fromIndex;
// Look for the item (the item can have multiple indices)
fromIndex = array.length - 1;
foundIndex = array.lastIndexOf(item, fromIndex);
while (foundIndex !== -1) {
// Remove the item (in place)
array.splice(foundIndex, 1);
// Bookkeeping
fromIndex = foundIndex - 1;
foundIndex = array.lastIndexOf(item, fromIndex);
}
// Return the modified array
return array;
}
Vanilla JavaScript(ES5.1) - (ES5.1) -不可变版本版本
浏览器支持: 与原版的香草 JavaScript 相同
/**
* Removes all occurences of the item from the array.
*
* Returns a new array with all the items of the original array except
* the specified item.
*/
function remove(array, item) {
var arrayCopy;
arrayCopy = array.slice();
return removeInPlace(arrayCopy, item);
}
香草ES6 -不可变版本版本
浏览器支持: Chrome 46, 边缘 12, Firefox 16, Opera 37, Safari 8 ()详细浏览器支持)
/**
* Removes all occurences of the item from the array.
*
* Returns a new array with all the items of the original array except
* the specified item.
*/
function remove(array, item) {
// Copy the array
array = [...array];
// Look for the item (the item can have multiple indices)
let fromIndex = array.length - 1;
let foundIndex = array.lastIndexOf(item, fromIndex);
while (foundIndex !== -1) {
// Remove the item by generating a new array without it
array = [
...array.slice(0, foundIndex),
...array.slice(foundIndex + 1),
];
// Bookkeeping
fromIndex = foundIndex - 1;
foundIndex = array.lastIndexOf(item, fromIndex)
}
// Return the new array
return array;
}