不为空,空了就替换为其它字符

不为空,空了就替换为其它字符

//例如 panduan('a','-')
function panduan(val, returnDate) {
    if (val === undefined || !val || val == 'null' || val == 'undefined') {
        return returnDate
    } else {
        return val
    }
}
console.log(panduan(123,'-')) //123
console.log(panduan("",'-')) //-
console.log(panduan("",'###')) //###