控制textarea 只能输入200个以内的字符
控制textarea 只能输入200个以内的字符。<textarea cols="" rows=""></textarea>
<!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=utf-8" /><title>无标题文档</title></head><script language=javascript><!--var maxLen=200;function checkMaxInput(obj){ var m=obj.value.length; var n=m; var j=0; for (var i=0;i<m;i++) {if(obj.value.charCodeAt(i)<0||obj.value.charCodeAt(i)>161){ n=n+1; if ( i < 100 ) { j=j+1; }} } if(n>maxLen) { obj.value=obj.value.substring(0,maxLen-j);remLen1.innerText='[最大可输入';remLen2.innerText=maxLen;remLen3.innerText='字符，';remLen4.innerText='您已达到输入上限！';remLen5.innerText=']'; } else {remLen1.innerText='[最大可输入';remLen2.innerText=maxLen;remLen3.innerText='字符，还可输入';remLen4.innerText=maxLen-n;remLen5.innerText='字符]'; }} //--></script><body ><textarea name="creditcontent" cols="45" rows="5" onKeyDown="checkMaxInput(this)" onKeyUp="checkMaxInput(this)"class="12pxbd"></textarea><br><font id="remLen1"></font><font color=red id="remLen2"></font><font id="remLen3"></font><font color=red id="remLen4"></font><font id="remLen5"></font>/body></html>
转自http://lisily.blog.163.com/blog/static/2441452008101025454465/
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