Js verification character length examples

In js, we can use the length function to determine the length of common pure letters and numbers. However, we may not be very accurate about Chinese characters, below I will add some related instances to your favorites.

For example, use the length function.

The Code is as follows:	Copy code
<Script type = "text/javascript"> Var txt = "Don't worry, n will have it. Come on! Hope to be ahead" Document. write (txt. length) </Script>

The output result of the above Code is: 19

Two Chinese Characters

The Code is as follows:	Copy code
// Oracle Varchar2 corresponds to three bytes for a Chinese character, so it is replaced by three x bytes. Var commentValue = commentValue. replace (/[^ x00-xff]/g, "xxx "); If (commentValue. length> 500 ){ Alert ("Max length is 150 Chinese or 500 English "); Return false; }