通过String.prototype函数设置String而不返回 [英] Set String via String.prototype function without return

问题描述

我有以下功能将 splice 添加到字符串中：

I have the following function to add splice to a string:

String.prototype.splice = function(index, howManyToDelete, stringToInsert) {
    var characterArray = this.split('');
    Array.prototype.splice.apply(characterArray, arguments);
    return characterArray.join('');
}

然而它确实完全像 Array.prototype .splice ，我需要它。数组拼接返回已删除的值。所以我只需要知道如何将新值设置为 String ，而不必返回值。

However it does quite work exactly like Array.prototype.splice, which I need it to. The array splice returns the values which were removed. So I just need to know how to set a new value to a String without having to return the value.

String.prototype.splice = function(index, howManyToDelete, stringToInsert) {
    var characterArray = this.split(''),
        retVal = Array.prototype.splice.apply(characterArray, arguments);
    newstringvalue = characterArray.join('');
    return retVal;
}

编辑：
显然你不能这样做，这将必须足够：

Apparently you can't do that, this will have to suffice:

String.prototype.splice = function(index, howManyToDelete, stringToInsert) {
    var characterArray = this.split(''),
        rem = Array.prototype.splice.apply(characterArray, arguments);
    return {'s' : characterArray.join(''), 'x' : rem.join('')};
}

推荐答案

你做不到。您不能以更改数组内容的方式更改字符串的值。

You can't do that. You can't change the value of a string in the way that you change the content of an array.

查看其他字符串方法，以及它们如何返回新的字符串值而不是更改字符串。

Look at the other string methods, and how they return the new string value rather than changing the string in place.

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