<!DOCTYPE html><html> <head lang="en"> <meta charset="UTF-8"> <title>输入文本</title> </head> <body> <p>字数限制在30字内，<span id=span>您还可以输入<b id=bb>30</b> 字</span></p> <textarea cols="50" rows="7" id="text"></textarea> <script type="text/javascript"> var text=document.getElementById('text'); var bb=document.getElementById('bb'); var span=document.getElementById('span'); var count=30,total,br; document.onkeyup=function(){ total=text.value.length; bb.innerHTML=count-total; if(total>30){ span.innerHTML='你已经超出'+(total-count)+'字'; } }//补充代码 </script> </body></html>
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