文本框限制字数
<table width="400" border="0" cellspacing="0" cellpadding="0"><tr valign="middle" bgcolor="#F3F3F3"><td height="26" valign="top" align="left"><textarea name="个人介绍" cols="50" rows="6" class="bot" id="youbian" onkeyup="checkLength(this);">http://Music.17gb.com</textarea><br>限制字数显示剩余字数，最大长度: 500还剩: <span id="chLeft">500</span><br></td></tr><script type="text/javascript">function checkLength(which) {var maxChars = 500;if (which.value.length > maxChars)which.value = which.value.substring(0,maxChars);var curr = maxChars - which.value.length;document.getElementById("chLeft").innerHTML = curr.toString();}</script></table>
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