[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~