js replace替换字符

str.replace(searchValue, replaceValue);

let str = "apple, apple, apple";
let newStr = str.replace(/apple/g, "orange"); // "orange, orange, orange"

let str = "1, 2, 3, 4, 5";
let newStr = str.replace(/\d+/g, function(match) {
    return parseInt(match) * 2;
}); // "2, 4, 6, 8, 10"

let str = "Hello, world!";
let newStr = str.replace("World", "JavaScript"); // 仍然是 "Hello, world!"，因为大小写不匹配

// 字符串替换示例
let str1 = "Hello, world!";
let newStr1 = str1.replace("world", "JavaScript");
console.log(newStr1); // 输出: "Hello, JavaScript!"

// 正则表达式替换示例
let str2 = "Hello, world! world!";
let newStr2 = str2.replace(/world/g, "JavaScript");
console.log(newStr2); // 输出: "Hello, JavaScript! JavaScript!"

// 使用回调函数进行复杂替换
let str3 = "1, 2, 3, 4, 5";
let newStr3 = str3.replace(/\d+/g, function(match) {
    return parseInt(match) * 2;
});
console.log(newStr3); // 输出: "2, 4, 6, 8, 10"