字符替换函数

//字符替换函数 用户输入原始字符串 替换字符 替换后字符 替换个数

"use strict"

let readline = require("readline-sync");

console.log("请输入字符串");

let str = readline.question("");

console.log("请输入要替换的字符");

let before = readline.question("");

console.log("请输入替换后的字符");

let after = readline.question("");

console.log("请输入要替换的个数");

let count = readline.question("");

console.log(strReplace(str,before,after,count));

function strReplace(str,before,after,count)

{

let num = 0;

let arr = str.split("");//将字符串转为数组

//遍历数组进行,找到就替换

for(let i=0;i<arr.length;i++){

if(num == count)// 如果替换次数达到用户输入的次数break

{

break;

}

if(arr[i] == before)

{

arr[i] = after;

num ++;//num保存替换的次数

}

}

str = arr.join("");//重新将数组转为字符串

return str;

}

原文地址：https://www.cnblogs.com/dbda/p/11407317.html