js join去空

const arr = [1, 2, '', null, 4, undefined, 5, NaN];

// 使用 filter() 去除空元素
const filteredArr = arr.filter(item => item !== null && item !== undefined && item !== '' && !Number.isNaN(item));

// 使用 join() 连接数组元素
const result = filteredArr.join(', ');

console.log(result); // 输出: "1, 2, 4, 5"

const arr = [1, 2, '', 4, 5];

const filteredArr = arr.filter(item => item !== '');

const result = filteredArr.join(', ');

console.log(result); // 输出: "1, 2, 4, 5"