纯js记住密码兑现 _JavaScript

纯js记住密码实现
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
	String path = request.getContextPath();
	String basePath = request.getScheme() + "://"
			+ request.getServerName() + ":" + request.getServerPort()
			+ path + "/";
	String IsPostBack="False";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>js COOKIE 记住帐号或密码</title>
<script type="text/javascript">
    window.onload=function onLoginLoaded() {
        if (isPostBack == "False") {
            GetLastUser();
        }
    };
     
    function GetLastUser() {
        var id = "49BAC005-7D5B-4231-8CEA-16939BEACD67";//GUID标识符
        var usr = GetCookie(id);
        if (usr != null) {
            document.getElementById('txtUserName').value = usr;
        } else {
            document.getElementById('txtUserName').value = "001";
        }
        GetPwdAndChk();
    }
    //点击登录时触发客户端事件
     
    function SetPwdAndChk() {
        //取用户名
        var usr = document.getElementById('txtUserName').value;
        alert("用户名："+usr);
        //将最后一个用户信息写入到Cookie
        SetLastUser(usr);
        //如果记住密码选项被选中
        if (document.getElementById('chkRememberPwd').checked == true) {
            //取密码值
            var pwd = document.getElementById('txtPassword').value;
            alert("你选择了记住密码，我们将记住你的密码："+pwd);
            var expdate = new Date();
            expdate.setTime(expdate.getTime() + 14 * (24 * 60 * 60 * 1000));
            //将用户名和密码写入到Cookie
            SetCookie(usr, pwd, expdate);
        } else {
            //如果没有选中记住密码,则立即过期
            ResetCookie();
        }
    }
     
    function SetLastUser(usr) {
        var id = "49BAC005-7D5B-4231-8CEA-16939BEACD67";
        var expdate = new Date();
        //当前时间加上两周的时间
        expdate.setTime(expdate.getTime() + 14 * (24 * 60 * 60 * 1000));
        SetCookie(id, usr, expdate);
    }
    //用户名失去焦点时调用该方法
     
    function GetPwdAndChk() {
        var usr = document.getElementById('txtUserName').value;
        var pwd = GetCookie(usr);
        if (pwd != null) {
            document.getElementById('chkRememberPwd').checked = true;
            document.getElementById('txtPassword').value = pwd;
        } else {
            document.getElementById('chkRememberPwd').checked = false;
            document.getElementById('txtPassword').value = "";
        }
    }
    //取Cookie的值
     
    function GetCookie(name) {
        var arg = name + "=";
        var alen = arg.length;
        var clen = document.cookie.length;
        var i = 0;
        while (i < clen) {
            var j = i + alen;
            //alert(j);
            if (document.cookie.substring(i, j) == arg) return getCookieVal(j);
            i = document.cookie.indexOf(" ", i) + 1;
            if (i == 0) break;
        }
        return null;
    }
    var isPostBack = "<%=IsPostBack%>";

	function getCookieVal(offset) {
		var endstr = document.cookie.indexOf(";", offset);
		if (endstr == -1)
			endstr = document.cookie.length;
		return unescape(document.cookie.substring(offset, endstr));
	}
	//写入到Cookie

	function SetCookie(name, value, expires) {
		var argv = SetCookie.arguments;
		//本例中length = 3
		var argc = SetCookie.arguments.length;
		var expires = (argc > 2) ? argv[2] : null;
		var path = (argc > 3) ? argv[3] : null;
		var domain = (argc > 4) ? argv[4] : null;
		var secure = (argc > 5) ? argv[5] : false;
		document.cookie = name + "=" + escape(value) + ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) + ((path == null) ? "" : ("; path=" + path)) + ((domain == null) ? "" : ("; domain=" + domain)) + ((secure == true) ? "; secure" : "");
	}

	function ResetCookie() {
		var usr = document.getElementById('txtUserName').value;
		var expdate = new Date();
		SetCookie(usr, null, expdate);
	}
</script>
</head>
<body>
	<form id="form1">
		<div>
			用户名: <input type="text" ID="txtUserName" onblur="GetPwdAndChk()">
			<input type="password" ID="txtPassword"> 密码： <input
				type="checkbox" ID="chkRememberPwd" /> 记住密码 <input type="button"
				OnClick="SetPwdAndChk()" value="进入" />
		</div>
	</form>
</body>
</html>