JavaScript实现文本框字数实时统计与限制

 <html> <head> <title>enter</title>  </head> <body> <center> <div style="text-align:left;"> <h3>昵称:</h3> <input type="text" id="mytext1" maxlength=15 onKeyUp="keypress1()"/> <font color="gray"><label id="name">你还可以输入15个字</label></font>  <h3>评论内容:</h3><br> <textarea id="myarea" style="height:100px;width:200px;overflow-x:hidden;overflow-y:hidden" onKeyUp="keypress2()" onblur="keypress2()"><&#47textarea> <font color="gray"><label id="pinglun">你还可以输入300个字</label></font> <div> </center> </body> </html> 

[Ctrl+A 全选 注:引入外部Js需再刷新一下页面才能执行]