Js judges Chinese characters and limits the number of characters in bytes

Javascript restricts text bytes, which is easy to implement. The only thing worth noting is the judgment of Chinese characters. Because Chinese and English occupy different bytes, English only occupies one byte, 2 Chinese characters are required. The following JavaScript Functions are usually written during project creation. After many revisions, they should be accurate and will be used later. The main function code is as follows:

Checkbyte. js code:

The following is an example. Before use, introduce checkbyte. js.

Value: value

ByteLength: Database Byte Length

Title: Chinese name of the field

Attribute: attribute name

Instructions for use:

1. onkeyup = "limitLength (this. value, 100, 'name', 'name ')"

2. id = "name" or [struts tag] styleId = "name"

Note that the id and attribute names must be the same.