错误:
Na3PO4 %2B Ba%28NO3%292 %3D NaNO3 %2B Ba3%28PO4%292
^
不需要的字符 ('%')Na3PO4 %2B Ba%28NO3%292 %3D NaNO3 %2B Ba3%28PO4%292
^
不需要的字符 ('%')