[javascript]在浏览器端应用cookie记住用户名

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
    <form action="http://www.baidu.com" id="frm">
        用户名<input type="text" name="" id="">
        密码<input type="password" name="" id="">
        <input type="submit" value="登陆">
        <a href="javascript:;" id="clear">清除记录</a>
    </form>

    <script>
        function setCookie (name, value, iDay){
            var oDate = new Date();
            oDate.setDate(oDate.getDate()+iDay);
            document.cookie = name+"="+value+";expires="+oDate;
        }

        function getCookie (name){
            var cookieArr = document.cookie.split("; ");

            for (var i = 0; i < cookieArr.length; i++) {
                var oneCookie = cookieArr[i].split("=");
                if (oneCookie[0] === name) {
                    return oneCookie[1];
                }
            }

            return '';
        } 

        function removeCookie (name) {
            setCookie(name, '1', -1);
        }

        function addListener (target, type, handler) {
            if (target.attachEventListener) {
                target.attachEventListener(type, handler, false);
            } else if (target.attachEvent) {
                target.attachEvent("on"+type, handler);
            } else {
                target["on"+type] = handler;
            }
        }

        window.onload = function (){
            var oForm = document.getElementById("frm");
            var oUser = oForm.getElementsByTagName("input")[0];
            var oClear = oForm.getElementsByTagName("a")[0];
            oForm.onsubmit = function (){
                var username = oUser.value;
                setCookie("username", username, 30);
            }

            oUser.value = getCookie('username');

            addListener(oClear, "click", function(){
                removeCookie("username");
                oUser.value = '';
            });
        }
    </script>
</body>
</html>
只有在firefox下，可以直接用浏览器打开文件测试，所以建议上传至服务器端~