如何从JavaScript中删除数组中的特定元素? [英] How do I remove a particular element from an array in JavaScript?

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问题描述

我有一个整数数组,我正在使用 .push()方法向其中添加元素。



是否有一种从数组中删除特定元素的简单方法?相当于 array.remove(int);



我必须使用 core JavaScript - 没有框架是允许的。

解决方案

找到要删除的数组元素的index ,然后使用 splice


splice()方法通过删除
现有元素和/或添加新元素来更改数组的内容。


  var array = [2,5,9]; console.log(array)var index = array.indexOf(5); if( index> -1){array.splice(index,1);} // array = [2,9] console.log(array);  



splice 的第二个参数是要删除的元素数。请注意 splice 修改数组并返回一个包含已删除元素的新数组。






注意对indexOf的浏览器支持是有限的; Internet和资源管理器7和8不支持它。



如果您在不受支持的浏览器中需要 indexOf ,请尝试以下 polyfill 。查找有关此 <的更多信息em> polyfill 此处

  Array.prototype.indexOf || (Array.prototype.indexOf = function(d,e){
var a;
if(null == this)抛出新的TypeError('this为null或未定义');
var c = Object(this),
b = c.length>>> 0;
if(0 === b)return -1;
a = + e | | 0;
Infinity === Math.abs(a)&&(a = 0);
if(a> = b)返回-1;
for(a = Math.max(0 <= a?a:b - Math.abs(a),0); a< b;){
if(a& c& c [a] = == d)返回a;
a ++
}
返回-1
});


I have an array of integers, and I'm using the .push() method to add elements to it.

Is there a simple way to remove a specific element from an array? The equivalent of something like array.remove(int);.

I have to use core JavaScript - no frameworks are allowed.

解决方案

Find the index of the array element you want to remove, then remove that index with splice.

The splice() method changes the contents of an array by removing existing elements and/or adding new elements.

var array = [2, 5, 9];
console.log(array)
var index = array.indexOf(5);
if (index > -1) {
  array.splice(index, 1);
}
// array = [2, 9]
console.log(array);

The second parameter of splice is the number of elements to remove. Note that splice modifies the array in place and returns a new array containing the elements that have been removed.


Note: browser support for indexOf is limited; it is not supported in Internet Explorer 7 and 8.

If you need indexOf in an unsupported browser, try the following polyfill. Find more info about this polyfill here.

Array.prototype.indexOf || (Array.prototype.indexOf = function(d, e) {
    var a;
    if (null == this) throw new TypeError('"this" is null or not defined');
    var c = Object(this),
        b = c.length >>> 0;
    if (0 === b) return -1;
    a = +e || 0;
    Infinity === Math.abs(a) && (a = 0);
    if (a >= b) return -1;
    for (a = Math.max(0 <= a ? a : b - Math.abs(a), 0); a < b;) {
        if (a in c && c[a] === d) return a;
        a++
    }
    return -1
});

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