javascript 字符串不能修改

   ECMAScript中的字符串是不可变的，也就是说字符串一旦创建，他们的值就不能改变。要改变某个变量保存的字符串，首先要销毁原来的字符串，然后用另一个包含新值的字符串填充该变量。

 

 在牛客打周赛的时候遇到了，遇到这个问题 

 

 想对字符串直接在线修改 ，发现不行，重写

 

 可以通过字符串分割的方式 ，把字符串分割成单个的数组。

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