Javascript 用Javascript中的字符串替换特定索引处的字符，Jquery
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Replacing character at a particular index with a string in Javascript , Jquery
提问by Bobby Francis Joseph
Is it possible to replace the a character at a particular position with a string
是否可以用字符串替换特定位置的字符
Let us say there is say a string : "I am a man"
假设有一个字符串： "I am a man"
I want to replace character at 7 with the string "wom"(regardless of what the original character was).
我想用字符串替换 7 处的字符"wom"（无论原始字符是什么）。
The final result should be : "I am a woman"
最终结果应该是： "I am a woman"
回答by Alnitak
Strings are immutablein Javascript - you can't modify them "in place".
字符串在 Javascript 中是不可变的——你不能“就地”修改它们。
You'll need to cut the original string up, and return a new string made out of all of the pieces:
您需要将原始字符串剪断，然后返回由所有部分组成的新字符串：
// replace the 'n'th character of 's' with 't'
function replaceAt(s, n, t) {
return s.substring(0, n) + t + s.substring(n + 1);
}
NB: I didn't add this to String.prototypebecause on some browsers performance is very bad if you add functions to the prototypeof built-in types.
注意：我没有添加它，String.prototype因为在某些浏览器上，如果向prototype内置类型添加函数，性能会很差。
回答by Tom
Or you could do it this way, using array functions.
或者你可以这样做，使用数组函数。
var a='I am a man'.split('');
a.splice.apply(a,[7,1].concat('wom'.split('')));
console.log(a.join(''));//<-- I am a woman
回答by Slavo
There is a string.replace()method in Javascript:
https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/String/replace
string.replace()Javascript 中有一个方法：https:
//developer.mozilla.org/en/JavaScript/Reference/Global_Objects/String/replace
P.S.
By the way, in your first example, the index of the "m" you are talking about is 7. Javascript uses 0-based indices.
PS
顺便说一下，在你的第一个例子中，你正在谈论的“m”的索引是 7。Javascript 使用基于 0 的索引。
