textare 限制字数

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=GB2312" />
        <title>textarea字数限制 练习代码多有参考网络 by ahuinan</title>
        <script language="JavaScript" type="text/javascript">    
            var TextUtil = new Object();
            TextUtil.NotMax = function(oTextArea){
                var maxText = oTextArea.getAttribute("maxlength");
                if(oTextArea.value.length > maxText){
                        oTextArea.value = oTextArea.value.substring(0,maxText);
                        alert("超出限制");
                }
            }
        </script>
    </head>
    <body>
        <textarea rows="10" cols="60" onpropertychange="TextUtil.NotMax(this)" maxlength="3"></textarea>
    </body>
</html>

posted @ 2012-09-10 22:50  小木v587  阅读(245)  评论(0)    收藏  举报