How to override padleft method in js

Please look at the code below

//重写padleft方法
        String.prototype.PadLeft = function (len, charStr) {
            var s = this + '';
            return new Array(len - s.length + 1).join(charStr) + s;
        }

##The above is what I compiled for everyone to rewrite padleft in js Method, I hope it will be helpful to everyone in the future.

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