如何在数组数据之间插入逗号，最后一项除外？

let array = ['apple', 'banana', 'cherry'];
let result = array.join(', ');
console.log(result); // 输出: apple, banana, cherry

let array = ['apple', 'banana', 'cherry'];
let result = array.map(item => item).join(', ');
console.log(result); // 输出: apple, banana, cherry

let array = ['apple', 'banana', 'cherry'];
let result = '';
for (let i = 0; i < array.length; i++) {
    result += array[i];
    if (i < array.length - 1) {
        result += ', ';
    }
}
console.log(result); // 输出: apple, banana, cherry

let array = ['apple', 'banana', 'cherry'];
let result = array.reduce((accumulator, currentValue, currentIndex) => {
    return accumulator + (currentIndex > 0 ? ', ' : '') + currentValue;
}, '');
console.log(result); // 输出: apple, banana, cherry