利用进制转换压缩数字函数分享

195 阅读 0 评论 129 点赞

我是靠谱客的博主朴素柠檬，最近开发中收集的这篇文章主要介绍利用进制转换压缩数字函数分享，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

复制代码代码如下:

function zipNum(num, radix){
    if(!zipNum.zip){
        zipNum.zip = function(inputNum){
            if(inputNum > 35){//用大写字母表示36-61
                return String.fromCharCode('A'.charCodeAt(0) + inputNum % 36);
            } else if(inputNum > 9){//用小写字母表示10-35
                return String.fromCharCode('a'.charCodeAt(0) + inputNum % 10);
            } else {
                return inputNum;
            }
        }
    }
    var quotient = num, remainder, result;
    if(radix > 36 && radix < 63){
        result = [];
        do {
            remainder = quotient % radix;
            quotient = parseInt(quotient / radix);
            result.push(zipNum.zip(remainder));
        }while(quotient > radix);
        remainder = quotient % radix;
        if(remainder !== 0){
            result.push(zipNum.zip(remainder));
        }
        result = result.reverse().join('');
    } else if(radix > 1 && radix < 36){
        result = num.toString(radix);
    } else {
        result = num;
        window.console && console.warn('radix argument must be between 2 and 62')
    }
    return result;
}

function testSortNum(){
    assertEquals(zipNum(61, 62), 'Z');
    assertEquals(zipNum(62 * 2 - 1, 62), '1Z');
    assertEquals(zipNum(62 * 3 - 1, 62), '2Z');
    assertEquals(zipNum(1361182624991, 62), 'dXN5fJB');
}
testSortNum();