var str = "abcd";
document.write (str.length); // Text Length
Fixed (); fixed string highlighted.
fontSize (5); text size is set character string.
fontColor (color); set a color string.
the toLowerCase (); all lowercase string.
toUpperCase (); string all uppercase.
Italics (); italics.
Bold (); bold.
Small (); small display.
indexOf (): determine the position of the first occurrence of the string.
subString (0,5); string interception.
split (specific string): string segmentation.