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javascript 10进制和64进制的转换

2014-07-30 09:43 429 查看
function string10to64(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 string64to10(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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