An input character was encountered that was not a digit 输入字符中包含非数字字符。
Matches a nondigit character 非数字字符匹配。
Shows how and where to use non - numeric and non - alphabetic characters 介绍使用非数字字符和非字母字符的方式和场所。
If it is , it parses the string until it reaches the end of the number , and returns the number as a number , not as a string 如果是,则执行到第一个非数字字符时结束,并将结果返回为数字。