代码如下： <!--脚本说明:第一步:把如下代码加入<head>区域中--> <SCRIPT LANGUAGE="JavaScript"> <!-- Begin maxLen = 130; // max number of characters allowed function checkMaxInput(form) { if (form.message.value.length > maxLen) // if too long.... trim it! form.message.value = form.message.value.substring(0, maxLen); // otherwise, update 'characters left' counter else form.remLen.value = maxLen - form.message.value.length; } // End --> </script> <!--第二步:把如下代码加入<body>区域中--> <form name=myform action="YOUR-SCRIPT.CGI"> <font size="1" face="arial, helvetica, sans-serif"> ( You may enter up to 125 characters. )<br> <textarea name=message wrap=physical cols=28 rows=4 onKeyDown="checkMaxInput(this.form)" onKeyUp="checkMaxInput(this.form)"> characters left
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