code: function(pinyinWithoutTone)
          {
              var newToneMap = {};
              for(var i in toneMap) newToneMap[toneMap[i]] = i;
              return (pinyinWithoutTone || '').replace(/[a-z]\d/g, function(m) {
                  return newToneMap[m] || m;
              });
          }
docs: 将数组拼音转换成真正的带标点的拼音
  @param pinyinWithoutTone 类似 xu2e这样的带数字的拼音