查找项目是否在 JavaScript 数组中的最佳方法? [英] Best way to find if an item is in a JavaScript array?

问题描述

查找对象是否在数组中的最佳方法是什么?

What is the best way to find if an object is in an array?

这是我所知道的最好的方法:

This is the best way I know:

function include(arr, obj) {
  for (var i = 0; i < arr.length; i++) {
    if (arr[i] == obj) return true;
  }
}

console.log(include([1, 2, 3, 4], 3)); // true
console.log(include([1, 2, 3, 4], 6)); // undefined

推荐答案

从 ECMAScript 2016 开始，您可以使用 includes()

As of ECMAScript 2016 you can use includes()

arr.includes(obj);

如果您想支持 IE 或其他旧浏览器:

If you want to support IE or other older browsers:

function include(arr,obj) {
    return (arr.indexOf(obj) != -1);
}

但这不适用于 IE6、7 或 8.如果它不存在，最好的解决方法是自己定义它:

This will not work on IE6, 7 or 8 though. The best workaround is to define it yourself if it's not present:

1. Mozilla 的(ECMA-262) 版本:

1. Mozilla's (ECMA-262) version:

   if (!Array.prototype.indexOf)
   {

        Array.prototype.indexOf = function(searchElement /*, fromIndex */)

     {


     "use strict";

     if (this === void 0 || this === null)
       throw new TypeError();

     var t = Object(this);
     var len = t.length >>> 0;
     if (len === 0)
       return -1;

     var n = 0;
     if (arguments.length > 0)
     {
       n = Number(arguments[1]);
       if (n !== n)
         n = 0;
       else if (n !== 0 && n !== (1 / 0) && n !== -(1 / 0))
         n = (n > 0 || -1) * Math.floor(Math.abs(n));
     }

     if (n >= len)
       return -1;

     var k = n >= 0
           ? n
           : Math.max(len - Math.abs(n), 0);

     for (; k < len; k++)
     {
       if (k in t && t[k] === searchElement)
         return k;
     }
     return -1;
   };

 }

丹尼尔·詹姆斯的版本:

 if (!Array.prototype.indexOf) {
   Array.prototype.indexOf = function (obj, fromIndex) {
     if (fromIndex == null) {
         fromIndex = 0;
     } else if (fromIndex < 0) {
         fromIndex = Math.max(0, this.length + fromIndex);
     }
     for (var i = fromIndex, j = this.length; i < j; i++) {
         if (this[i] === obj)
             return i;
     }
     return -1;
   };
 }

雄鸡酸 的版本:

 Array.prototype.hasObject = (
   !Array.indexOf ? function (o)
   {
     var l = this.length + 1;
     while (l -= 1)
     {
         if (this[l - 1] === o)
         {
             return true;
         }
     }
     return false;
   } : function (o)
   {
     return (this.indexOf(o) !== -1);
   }
 );

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