<%@ Page Language="C#" AutoEventWireup="true" CodeFile="test.aspx.cs" Inherits="test" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <script type="text/javascript"> var maxstrlen = 140; function Q(s) { return document.getElementById(s); } function checkWord(c) { len = maxstrlen; var str = c.value; myLen = getStrleng(str); var wck = Q("wordCheck"); if (myLen > len * 2) { c.value = str.substring(0, i + 1); } else { wck.innerHTML = Math.floor((len * 2 - myLen) / 2); } } function getStrleng(str) { myLen = 0; i = 0; for (; (i < str.length) && (myLen <= maxstrlen * 2); i++) { if (str.charCodeAt(i) > 0 && str.charCodeAt(i) < 128) myLen++; else myLen += 2; } return myLen; } </script> <title></title> </head> <body> <h1>请根据活动流程参与活动，请重新点击好友链接，支持好友！</h1> <div style="font-size: 16px"> 控制输入框字符输入，计算输入字符总数,显示剩余字数;<br> 一个英文字符算一个字符，一个中文字符算两个字符计算。 </div> <div> <textarea onKeyUp="javascript:checkWord(this);" onKeyDown="javascript:checkWord(this);" name="content" id="content" style="overflow-y: scroll"> </textarea> </div> <DIV> 还可以输入<span style="font-family: Georgia; font-size: 26px;" id="wordCheck">140</span>个字符 </div> </body> </html>