[javascript] How to Generate a random number of fixed length using JavaScript?

I created the below function to generate random number of fix length:

function getRandomNum(length) {
    var randomNum = 
        (Math.pow(10,length).toString().slice(length-1) + 
        Math.floor((Math.random()*Math.pow(10,length))+1).toString()).slice(-length);
    return randomNum;
}

This will basically add 0's at the beginning to make the length of the number as required.

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