js code about text word limit_form effects

When working on a project, I write a piece of js for everyone. Regarding the problem of limiting the number of characters in text, it is often used in actual development; the main problem occurs in the restriction of Chinese. The following code solves the verification problem of limiting the number of bytes; just save this code to a js file and Introduce it into the verification page and you can use it! At the same time, I hope you will give me your strong support and valuable opinions. I will publish more good articles in my spare time in the future, thank you! !
/*
value: value;
byteLength: database byte length
title: Chinese name of field
attribute: attribute name
Instructions for use:
Add (1) onkeyup="limitLength(this.value,100,'name','name')"
        (2) id="name" or [struts tag] styleId="name"
Note: id name and attribute The attribute names should be the same
Example: <br> or <br><input> <br>*/ <br>function limitLength(value, byteLength, title, attribute) { <br> var newvalue = value. replace(/[^x00-xff]/g, "**"); <br> var length = newvalue.length; <br> //When the number of bytes filled in is less than the set number of bytes <br> if ( length * 1                                                                  = "" ; <br> for (var i = 0; i var flat = limitDate.substr(i, 1); <br> if (flat == "*") { <br>                                                                                                count; 🎜 > //if the base point is ×; determine whether there is an even number or an odd number if there is * 1 - count); <br> limitvalue = value.substr(0, size); } else { <br> Ength * 1 - count); <br> limitvalue = value.substr(0, size); <br> } <br> alert(title "Maximum input" byteLength "bytes (equivalent to " byteLength /2 " Chinese characters)! "); <br> document.getElementById(attribute).value = limitvalue; <br> return; <br>}