?????????? 0 == '0' ????ture
????????????????????????? switch?????????????????2???????????????????????????? _switch = 0.
????????????????????_switch = data.switch??
????????????????????
????if(_switch) { ???1
????}else{ ???2
????}
????????????????????..
????????????????????switch??string?????0??"0"??
?????? *&??&@??#@??#&??......
??????????????????????????1??
???????????????棬??? 0 == '0' ???? if(0) ?? if('0') ??????????if??????????ж???ж?????????????......