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This article mainly introduces the relevant knowledge of "JavaScript based on extended String how to replace characters in index string", Xiaobian shows you the operation process through an actual case, the method of operation is simple, fast and practical. I hope that this article "JavaScript based on extended String how to replace characters in index string" can help you solve the problem.

Core code:

String.prototype.replaceCharAt = function (n, c) {return this.substr (0, n) + c + this.substr;}

Usage example:

JS character substitution String.prototype.replaceCharAt = function (NMagazine c) {return this.substr (0, n) + c + this.substr (Nomi1meme this.milthMurray 1PUBN);} var str = 'welcome to www.jb51.net';console.log (str.replaceCharAt (8meme T'))

The running effect is as follows:

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