JS Judge input string length instance code (Chinese characters Count two characters, alphanumeric is one) _javascript tips

JS to determine the input string length instance code (Chinese character count two characters, alphanumeric count one)

Text input, this method validation is thought of because the database table field length limit causes the commit to fail.

The nonsense is not much to say code:

Above this JS to judge the input string length instance code (Chinese characters Count two characters, alphanumeric is a) is a small series to share all the content, hope to give you a reference, but also hope that we support the cloud habitat community.