输入框字数提示

来源:互联网 发布:python的全局变量 编辑:程序博客网 时间:2024/05/01 08:00
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title><script language="javascript"> //传过来的参数是标签的ID function countChar(textareaName,spanName){  document.getElementById(spanName).innerHTML = 140 - document.getElementById(textareaName).value.length;} </script></head><body>可以输入<span id="counter">140</span>字<br/><textarea id="status"  name="status" rows="6" cols="40" onkeydown='countChar("status","counter");' onkeyup='countChar("status","counter");' maxlength="140"></textarea></body></html>

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