JS检测输入字符个数，界别汉字和英文
日期：2014-05-16 浏览次数：20308 次
JS检测输入字符个数，区分汉字和英文
<!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> <title>CheckInputLength</title> <script language="javascript" type="text/javascript">... function getStringUTFLength(str) ...{ var value = str.replace(/[^\\x00-\\xff]/g," "); return value.length; } function leftUTFString(str,len) ...{ if(getStringUTFLength(str)<=len) return str; var value = str.substring(0,len); while(getStringUTFLength(value)>len) ...{ value = value.substring(0,value.length-1); } return value; } function count() ...{ var value = document.getElementById("licenseother").value; value = value.replace(/[\\u4e00-\\u9fa5]/g," "); if(value.length>=20) ...{ try...{ with(window.event) ...{ cancelBubble = true; keyCode=0; returnValue = false; } }catch(e)...{} document.getElementById("licenseother").value = leftUTFString(document.getElementById("licenseother").value,20); } document.getElementById("result").value = 20-getStringUTFLength(document.getElementById("licenseother").value); } </script> </head> <body> <table width="100%"> <tr><td> 本输入框限制输入20个字符(汉字计算为2个字符：) </td></tr> <tr><td> <textarea cols=80 rows=3 wrap="virtual" id="licenseother" onkeypress="count()" onkeyup="count()" onblur="count();" onChange="count();"></textarea> </td></tr> <tr><td> 剩余字符数：<input type="text" size="3" id="result" value="20"&g
<!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> <title>CheckInputLength</title> <script language="javascript" type="text/javascript">... function getStringUTFLength(str) ...{ var value = str.replace(/[^\\x00-\\xff]/g," "); return value.length; } function leftUTFString(str,len) ...{ if(getStringUTFLength(str)<=len) return str; var value = str.substring(0,len); while(getStringUTFLength(value)>len) ...{ value = value.substring(0,value.length-1); } return value; } function count() ...{ var value = document.getElementById("licenseother").value; value = value.replace(/[\\u4e00-\\u9fa5]/g," "); if(value.length>=20) ...{ try...{ with(window.event) ...{ cancelBubble = true; keyCode=0; returnValue = false; } }catch(e)...{} document.getElementById("licenseother").value = leftUTFString(document.getElementById("licenseother").value,20); } document.getElementById("result").value = 20-getStringUTFLength(document.getElementById("licenseother").value); } </script> </head> <body> <table width="100%"> <tr><td> 本输入框限制输入20个字符(汉字计算为2个字符：) </td></tr> <tr><td> <textarea cols=80 rows=3 wrap="virtual" id="licenseother" onkeypress="count()" onkeyup="count()" onblur="count();" onChange="count();"></textarea> </td></tr> <tr><td> 剩余字符数：<input type="text" size="3" id="result" value="20"&g
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