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If the data is "4", the front desk will display "04". If the background is "04", the front desk will display "04"

For example
"1" => "01"
"4" => "04"
"99" => "99"

Use slices

var addPrefix = str => ('00' + str).slice(-2); 

This can do what you need: pad zeros for one digit and retain only two digits for three digits

var num = '1';

num = Number(num);

num = num<10? '0'+num : num;

//What does it mean to keep two digits in a three-digit number? ? ? ?
//num = (num==100 || num>100)? ... : ...

function x(d){
    D=d<10?`0$wjcelcm34c`:`$wjcelcm34c`.match(/^\d{2}/)[0];return D
}

parseInt('04')<10?'0'+parseInt('04'):'04'