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Javascript 二进制/十进制/十六进制之间的转换

Posted by fiture / 2013年02月06日 / Javascript」「分享

进制之间的转换,或者二进制的位运算,应该是上学的时候计算机基础里面都学过,但是总总原因现在居然都不会了!其实之前几天都一直在学习,这些最基础的东东,起因是因为"\u4F60"类似的字符串,这里关于JS中的字符表示方法用空再继续研究,whatever,现在的情况是基础不扎实智商是硬伤!╮(╯▽╰)╭

在Javascript中,我们可以利用一些函数(parseInt()、toString())很方便的进行进制之间的转换。用不着写函数,用最基础的数学方法去实现(虽然这也很重要!)。

  1. 二进制、八进制、十六进制转换为十进制

    这里就要用到强大的parseInt()啦,它可以转换类数字的字符串,具体请google,进制的转换也可以用到她。parseInt()用法:

          parseInt(str, radix)
        

    接受两个参数一个是要转换的字符串,一个是基数(进制数)在2-36之间的数,不在这范围的话,就return NaN了。如果第一个参数以0x开头,默认转换为16进制数,如果第二参数为空或者0则默认转换为10进制数。拿整数88来举例啦,因为比较简单:

    // 88的二进制是1011000, 八进制是0130, 十六进制是: 0x58
    parseInt('88'); //默认采用10进制,结果:88
    parseInt('1011000', 2); //采用2进制转换,结果:88
    parseInt('0130', 8); //采用8进制转换,结果:88
    parseInt('0x58'); //以0x开头默认采用16进制转换,结果:88
    
    //不一样的表示方法:
    parseInt('01011000', 2); //采用2进制转换,结果:88  如果是8位的二进制
    parseInt('0x0058', 16); //采用16进制转换,结果:88  不知道为啥前面要加两个00?
        
  2. 十进制转换为二进制、八进制、十六进制的字符串

    这里就可以用number.toSting()方法啦,和上面的parseInt()类似,toString(radix), 接受一个基数规则和上面一样。(2-32).这样我们就可以很方便的把十进制转换为想要的进制了。

    // 主角仍然是88.
    (88).toString(2); //结果:'1011000'
    (88).toString(8); //结果:'130'
    (88).toString(16); //结果:'58'
        

其实挺简单的,比起用一个一个的去转换来得快。额,我觉得Javascript的进制转换,现在最大用处就是去转换unicode编码的字符串。Maybe,昨天折腾淘宝的UED/quiz2收获还是蛮大。有兴趣可以试试,我要吐嘈的是第四题,什么东东啊,手的点酸了!基础不行啊,智商是硬伤!加油学习吧,骚年!

今天放假了,最后祝大家新年快了,过年8888大财!O(∩_∩)O~

12条回应:“Javascript 二进制/十进制/十六进制之间的转换”

  1. 牧风说道:

    第一题是base64

    • Mitch说道:

      Thanks for your thosuhtg. It’s helped me a lot.

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  2. 馒头饭说道:

    感谢楼主分享,很有用

  3. hostgator说道:

    对这方面已经忘记了

  4. wwek说道:

    把关于的评论打开!! 域名很“巴适”

  5. […] 之前有写过《Javascript 二进制/十进制/十六进制之间的转换》,提到过Unicode的转换的问题。Javascript内置了转换函数:String.fromCharCodeAt()、string.charCodeAt()来进行字符串与编码之间的转换。 […]

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