删除阵列键时它包含在JavaScript字符串 [英] Delete an array key when it contains a string in javascript

问题描述

我在JavaScript的一个数组，看起来像这样：

ARR = [md51234，md55234]

我试图做去除这一个项目：

删除ARR [md51234]

不过，这似乎并没有工作。有另一种方式来删除此？

@dystroy提供了答案，我的indexOf添加到阵列原型不兼容的浏览器：

 如果（！Array.prototype.indexOf）{
    Array.prototype.indexOf =功能（OBJ，开始）{
         对于（VAR I =（启动|| 0），J = this.length; I＆LT;焦耳;我++）{
             如果（这[一] === OBJ）{回报我; }
         }
         返回-1;
    }
}
 

解决方案

您必须提供的索引，而不是值：

 删除ARR [0];
 

另外，您也可以使用的indexOf 大多数浏览器

 删除ARR [arr.indexOf（md51234）];
 

但是请注意，删除不作阵短，只是做一个值undefined。有使用后，您的阵列删除是

  [未定义md55234]
 

如果你想在阵列短，用

  arr.splice（0，1）; //第一个参数是元素删除的索引，第二个是元素删除的数
 

这使得

  [md55234]
 

I have an array in javascript that looks like this:

arr = ["md51234","md55234"]

I'm trying to remove an item from this by doing:

delete arr["md51234"]

But this doesn't seem to work. Is there another way to remove this?

@dystroy provided the answer, I added indexOf to the array prototype for non-compliant browsers:

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

解决方案

You must provide the index, not the value :

delete arr[0];

Alternatively, you could also use indexOf on most browsers

delete arr[arr.indexOf("md51234")];

But note that delete doesn't make the array shorter, it just make a value undefined. Your array after having used delete is

[undefined, "md55234"]

If you want to make the array shorter, use

arr.splice(0, 1); // first parameter is index of element to remove, second one is number of elements to  remove

This makes

["md55234"]

这篇关于删除阵列键时它包含在JavaScript字符串的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！