【每日一练】两个数字长度一致，不一致的前面加0补齐

function padding0ToHeader(num1,num2){
    let a = num1.toString()
    let b = num2.toString()
    let maxLength = Math.max(a.length,b.length)
    a=a.padStart(maxLength,0)
    b=b.padStart(maxLength,0)
    return [a,b]
}