FormatException (FormatException: Invalid double )

try { var n = double.parse('n4wer2'); print(n); } on FormatException { print('Format error!'); }

flutter 字符串转浮点数时，字符串包含除了数字之外的字母，导致FormatException (FormatException: Invalid double ) 解决方法 var n = double.parse('n4wer2', (source) => 1);