function string10to62(number) { var chars = '0123456789abcdefghigklmnopqrstuvwxyzABCDEFGHIGKLMNOPQRSTUVWXYZ'.split(''), radix = chars.length, qutient = +number, arr = []; do { mod = qutient % radix; qutient = (qutient - mod) / radix; arr.unshift(chars[mod]); } while (qutient); return arr.join(''); } function string62to10(number_code) { var chars = '0123456789abcdefghigklmnopqrstuvwxyzABCDEFGHIGKLMNOPQRSTUVWXYZ', radix = chars.length, number_code = String(number_code), len = number_code.length, i = 0, origin_number = 0; while (i < len) { origin_number += Math.pow(radix, i++) * chars.indexOf(number_code.charAt(len - i) || 0); } return origin_number; }
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