js计算当前输入的个数，汉字算两个字符

来源：互联网发布：mac app下载编辑：程序博客网时间：2024/04/27 15:17

function  getStringLen(Str){   var   i,len,code;   if(Str==null || Str == "")   return   0;   len   =   Str.length;   for   (i   =   0;i   <   Str.length;i++)     {     code   =   Str.charCodeAt(i);   if   (code   >   255) {len ++;}   }   return   len;   }

//计算当前输入的个数，汉字算两个字符function checkLen(value,length){var len = getStringLen(value);//提示当前输入的个数$("#lblSummary"+length).html("当前最大长度为:<font color='red'>"+length+"</font>,还可以输入：<font color='red'>"+(length-len)+"</font>");if(len>length){flag = false;}else{flag = true;}}

<textarea class="codeInput" id="summary" title="最长150字符,75个汉字" name="summary" cols="80" rows="5" onkeyup="checkLen(this.value, 150)" wrap="virtual">${notice.summary}</textarea><div id="lblSummary150"></div>

demo可以直接运行：

<!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><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>无标题文档</title><SCRIPT language=JavaScript> function  getStringLen(Str){   var   i,len,code;   if(Str==null || Str == "")   return   0;   len   =   Str.length;   for   (i   =   0;i   <   Str.length;i++)     {     code   =   Str.charCodeAt(i);   if   (code   >   255) {len ++;}   }   return   len;   } function checkLen(value,length){var len = getStringLen(value);alert(len);}</SCRIPT></head><body onLoad="length()"><span style="LINE-HEIGHT: 180%"><textarea name="request" cols="45" rows="8" onKeyUp="checkLen(this.value, 500);"></textarea></body></html>

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