将string数组转换为number数组

        let x1 = ['1','2'];
        console.log(x1);
        //["1", "2"]

        x1 = x1.map(Number);
        console.log(x1);
        //[1, 2]

将number数组转换为string数组

        let x1 = [1,2];
        console.log(x1);
        //[1, 2]

        x1 = x1.map(String);
        console.log(x1);
        //["1", "2"]