A Simple Method for javaScript to determine whether a string is a number

Copy codeThe Code is as follows:
ParseInt ("Hello", 10); // return NAN
ParseInt ("110", 10); // return 110

Therefore, the simple method to determine whether a string is a number is to use isNaN (). If true is returned, the string is not a number; otherwise, it is a number.
Copy codeThe Code is as follows:
IsNaN (parseInt ("Hello", 10); // true;
IsNaN (parseInt ("110", 10); // false;

Note: The following methods cannot be used for determination:
Copy codeThe Code is as follows:
ParseInt ("Hello", 10) = NaN; // return false
ParseInt ("110", 10) = NaN; // return false

Because NaN does not want to wait for it, this is special. The method for judging NaN uses isNaN ();