如何使用 JavaScript 从字符串中删除字符? [英] How can I remove a character from a string using JavaScript?

问题描述

我很接近得到这个，但它只是不对.我想要做的就是从字符串中删除字符 r.问题是，字符串中有多个 r 的实例.但是，它始终是索引 4 处的字符(因此是第 5 个字符).

I am so close to getting this, but it just isn't right. All I would like to do is remove the character r from a string. The problem is, there is more than one instance of r in the string. However, it is always the character at index 4 (so the 5th character).

示例字符串: crt/r2002_2

我想要的: crt/2002_2

这个替换函数删除了 r

mystring.replace(/r/g, '')

产生:ct/2002_2

我试过这个功能:

String.prototype.replaceAt = function (index, char) {
    return this.substr(0, index) + char + this.substr(index + char.length);
}
mystring.replaceAt(4, '')

它只有在我用另一个字符替换它时才有效.它不会简单地删除它.

It only works if I replace it with another character. It will not simply remove it.

有什么想法吗?

推荐答案

var mystring = "crt/r2002_2";
mystring = mystring.replace('/r','/');

将使用 String.prototype.replace.

will replace /r with / using String.prototype.replace.

或者，您可以使用带有全局标志的正则表达式(如 Erik Reppen & Sagar Gala，下面)将所有出现的内容替换为

Alternatively you could use regex with a global flag (as suggested by Erik Reppen & Sagar Gala, below) to replace all occurrences with

mystring = mystring.replace(//r/g, '/');

由于每个人都在这里玩得很开心而且 user1293504 似乎不会很快回来回答澄清问题，这里是从字符串中删除第 N 个字符的方法:

Since everyone's having so much fun here and user1293504 doesn't seem to be coming back any time soon to answer clarifying questions, here's a method to remove the Nth character from a string:

String.prototype.removeCharAt = function (i) {
    var tmp = this.split(''); // convert to an array
    tmp.splice(i - 1 , 1); // remove 1 element from the array (adjusting for non-zero-indexed counts)
    return tmp.join(''); // reconstruct the string
}

console.log("crt/r2002_2".removeCharAt(4));

由于 user1293504 使用正常计数而不是零索引计数，我们必须从索引中删除 1，如果您希望使用它来复制 charAt 的工作方式，请不要减去 1从第 3 行的索引并使用 tmp.splice(i, 1) 代替.

Since user1293504 used the normal count instead of a zero-indexed count, we've got to remove 1 from the index, if you wish to use this to replicate how charAt works do not subtract 1 from the index on the 3rd line and use tmp.splice(i, 1) instead.

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