javascript 动态统计文本域输入字符个数

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 <script language="javascript"> //countChar(a,b)为多行文本框统计输入字符 function countChar(textareaName,spanName){ var maxLimit=70; var textArea=document.getElementById(textareaName); var spanCount=document.getElementById(spanName); if (textArea.value.length>maxLimit){ spanCount.innerHTML='0'; textArea.value = textArea.value.substring(0, maxLimit); }else{ spanCount.innerHTML =maxLimit-textArea.value.length; } } </script> <p><span>您还可以输入<b><spanid="counter">70</span></b>个字</span></p> <p> <textarea name="inputContent" rows="10" class="ssmsarea" id="status" onKeyDown='countChar("status","counter");'onKeyUp='countChar("status","counter");'></textarea> </p>