如何从 JavaScript 中的数组中删除特定的元素？

Question

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.

转载于:https://stackoverflow.com/questions/5767325/how-do-i-remove-a-particular-element-from-an-array-in-javascript

Answer 1

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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