javascript zero padding function collection

When outputting an integer, if you need to add zeros in front or behind to a certain length, you can use the following function.

function padLeft(str,lenght){ 
if(str.length >= lenght) 
return str; 
else 
return padLeft("0" +str,lenght); 
} 
function padRight(str,lenght){ 
if(str.length >= lenght) 
return str; 
else 
return padRight(str+"0",lenght); 
}

Function that automatically adds zeros before the number
Function
function xx(a,b,c)
{
....
}

Parameters
xx(98,102,4)

Result

0098 0099 0100 0101 0102
------------------ ----------------------------------
I wonder if everyone understands?

Give a starting value (any positive integer less than B), an end value (any positive integer greater than A), and a limit length value (any positive integer), the function can be automatically generated A number, automatically padded with zeros in front
The following is the implementation code

<script> 
function addZero(a,b,c) 
{ 
    while(a<b) 
    { 
        t=a+""; 
        while(t.length<c)t="0"+t; 
        a++; 
        document.write(t+"<br>"); 
    } 
} 
addZero(1,10,5); 
</script>

<script language="javascript"> 
String.prototype.forstr=function(str) 
{ 
    var str2="" 
    for(var i=0;i<str;i++) 
    { 
        str2=str2+"0" 
    } 
    return str2+this 
} 
var arr=new Array() 
function gh(a,b,c) 
{ 
    for(var a,i=0;a<=b;a++,i++) 
    { 
        lenb=b.toString().length+c 
        arr[i]=a.toString().forstr(c).substring(lenb,lenb-c) 
    } 
return arr 
} 

alert(gh(98,102,4)) 
</script>

If you enter 1, it becomes 001, 2 is 002, 10 is 010, and so on

/**格式化数字为一个定长的字符串，前面补０ 
*参数: 
* Source 待格式化的字符串 
* Length 需要得到的字符串的长度 
*/ 
function FormatNum(Source,Length){ 
var strTemp=""; 
for(i=1;i<=Length-Source.length;i++){ 
strTemp+="0"; 
} 
return strTemp+Source; 
}

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