JavaScript Instance Tutorial: substring () usage

Article Introduction: substring () usage.

A small example:
var name= "";
VAR FirstName;
Name=prompt ("Please enter your name, to lowercase pinyin");
Firstname=name.substring (0,1);//Intercept First character
Name=firstname.touppercase () +name.substring (1);
document.write (name);
What has been learned from this example?
1,substring (start,end) is used to intercept strings, the index starts at 0, and the method returns a string containing a substring from start to the last (not including end)
2, if there is only one argument, represents all the strings starting from this argument to the end.
3,touppercasubstringse () turns lowercase to uppercase English