改变字符串值的字符串原型 [英] String prototype changing the string value

问题描述

我正在尝试更改其原型函数中的字符串值:

I'm trying to change the string value inside its protoype function:

String.prototype.myfunction=function(){
    this += "a";
    return this;
};

但似乎我无法更改该值.如果我尝试在控制台上运行它，我只会收到错误:Uncaught ReferenceError: Invalid left-hand side in assignment

But as it seems I just can't change the value. If I try to run that on the console I just get the error: Uncaught ReferenceError: Invalid left-hand side in assignment

是否可以更改字符串值?提前致谢

Is it possible to change the strings value? Thanks in advance

推荐答案

我认为这与字符串的不变性以及 this 是一个常量这一事实有关.

I think it has to do with the immutability of strings and the fact that this is a constant.

如果您的示例简单地更改为:

It works just fine if your example is trivially changed to:

String.prototype.myfunction=function(){
    return this + 'a';
};

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