**接受xml字符串返回abc类信息**
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## Option
| 参数 |	类型 |	默认值 |	必填 |	说明 |
| -- | -- | -- | -- | -- |
| xmlStr | String | | 是 | xml字符串 |
| noTitle | Boolean | false | 否 | 不展示title |
| noPiano | Boolean | false | 否 | 不展示piano |
| abcOpn | Object | | 否 | 具体见下表 |

### abcOpn参数
| 参数 |	类型 |	默认值 |	必填 |	说明 |
| -- | -- | -- | -- | -- |
| u | Number | 0 | 否 | unfold repeats | 
| b | Number | 0 | 否 | bars per line | 
| n | Number | 0 | 否 | chars per line | 
| c | Number | 0 | 否 | credit text filter level (0-6) | 
| v | Number | 0 | 否 | no volta on higher voice numbers | 
| d | Number | 0 | 否 | denominator unit length | 
| m | Number | 0 | 否 | no midi, minimal midi, all midi output (0,1,2) | 
| x | Number | 0 | 否 | no line breaks | 
| t | Number | 0 | 否 | perc, tab staff -> voicemap | 
| v1 | Number | 0 | 否 | all directions to first voice of staff | 
| noped | Number | 0 | 否 | no pedal directions | 
| stm | Number | 0 | 否 | translate stem elements (stem direction) | 
| munm | Number | -1 | 否 | number every mnum measures | 
| p | String | '' | 否 | page format: scale (1.0), width, left- and right margin in cm | 
| s | Number | 0 | 否 | shift note heads in tablature | 

## return
| key | 类型 | 说明 |
| -- | -- | -- |
| xmlStr | String | xml字符串 |
| xmlDom | XML Element | xml dom元素 |
| abcStr | String | abc字符串 |