sinaimg.js

//http://www.cnblogs.com/gaizai/p/4233780.html
//https://www.v2ex.com/t/388152?p=2
(function () {
  'use strict';

  function string10to62(number) {
    var chars = '0123456789abcdefghigklmnopqrstuvwxyzABCDEFGHIGKLMNOPQRSTUVWXYZ'.split('');
    var radix = chars.length;
    var qutient = +number;
    var arr = [];

    while (qutient !== 0) {
      var mod = qutient % radix; // 余数
      arr.unshift(chars[mod])
      qutient = (qutient - mod) / radix; //求商
    }

    return arr.join('');
  }

  function string62to10(number_code) {
    number_code = String(number_code);
    var chars = '0123456789abcdefghigklmnopqrstuvwxyzABCDEFGHIGKLMNOPQRSTUVWXYZ',
      radix = chars.length,
      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;
  }

  function decode(url) {
    var lastIndexOfSlash = url.lastIndexOf('/');
    var number = url.substr(lastIndexOfSlash + 1, 8);
    if (number.startsWith('00')) {
      return string62to10(number);
    } else {
      return parseInt(number, 16);
    }
  }

  window.location = 'https://weibo.com/u/' + decode(window.location.href);
})();