动态计算还能够输入多少字节的表单（纯script，请吧昨天的精华替换成这个吧，那个中文也算1字节

<script language=JavaScript> function strlength(str){     var l=str.length;     var n=l     for (var i=0;i<l;i++)     {         if (str.charCodeAt(i)<0||str.charCodeAt(i)>255) n++     }     return n         } function changebyte(value,length){     var l=strlength(value)     if (l<=length) {         if (document.all!=null) document.all(byte).innerText=还可以输入+(length-l)+字节     }     else     {         document.all(byte).innerText=输入字节数超出范围     }     return true } function changebyte1(value,length){     var l=strlength(value)     if (l<=length) {         if (document.all!=null) document.all(byte1).innerText=还可以输入+(length-l)+字节     }     else     {         document.all(byte1).innerText=输入字节数超出范围     }     return true } function changebyte2(value,length){     var l=strlength(value)     if (l<=length) {         if (document.all!=null) document.all(byte2).innerText=还可以输入+(length-l)+字节     }     else     {         document.all(byte2).innerText=输入字节数超出范围     }     return true } </script> <form method=post name=test onSubmit=return checkdata() action=> <TEXTAREA onkeydown=return changebyte1(document.test.icqcontent.value,198) onkeyup=return changebyte1(document.test.icqcontent.value,198) name=icqcontent cols=40 rows=3></TEXTAREA> <SPAN id=byte1><SCRIPT language=JavaScript>changebyte1(document.test.icqcontent.value,198);</SCRIPT></SPAN> </form>

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