js计算文本框输入的字符数

使用JavaScript实时的计算用户当前输入的字符数函数代码：

<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>JavaScript统计字符数</title> <script language="javascript"> function CountWords（obj, show_id）{var fullStr = obj.value;var charCount = fullStr.length;var rExp = /[^A-Za-z0-9]/gi;var spacesStr = fullStr.replace（rExp, " "）;var cleanedStr = spacesStr + " ";do{ var old_str = cleanedStr; cleanedStrcleanedStr = cleanedStr.replace（" ", " "）;}while（ old_str ！= cleanedStr ）; var splitString = cleanedStr.split（" "）; document.getElementById（show_id）.innerHTML=charCount; } </script> </head> <body> <form> <textarea cols="40" rows="5" name="x" onkeyup="CountWords（this,"show"）" /> </textarea> </form> <div id="show">0</div> </body> </html>

javascript实现统计字符数很简单，上面分享给大家的代码可以直接使用，希望对大家的学习有所帮助。