js 记住密码以及密码的base64解码

附上例子

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form  class="form-horizontal login-location" id="myform" autocomplete="on">
    <div class="form-group">
        <label class="col-sm-3 col-xs-3 control-label label-text">账号</label>
        <div class="col-sm-9 col-xs-9">
            <input type="text" name="data[username]"  placeholder="教师/学生账号"  class="form-control" id="username">
        </div>
    </div>
    <div class="form-group">
        <label class="col-sm-3 col-xs-3 control-label label-text">密码</label>
        <div class="col-sm-9 col-xs-9">
            <input type="password" name="data[password]"  placeholder="密码" class="form-control" id="password">
        </div>
    </div>
    <div class="form-group">
        <label class="col-sm-3 col-xs-3 control-label label-text"></label>
        <div class="col-sm-9 col-xs-9 checkbox">
            <label><input type="checkbox" id="remember">请记住我</label>
        </div>
    </div>
    <div class="form-group">
        <div class="col-md-12">
            <button class="btn btn-success btn-block"  type="submit">立即登录</button>
        </div>
    </div>
</form>
<script>
    let base = new Base64();
    window.onload = function(){
        var oForm = document.getElementById('myform');
        var oUser = document.getElementById('username');
        var oPswd = document.getElementById('password');
        var oRemember = document.getElementById('remember');
        //页面初始化时,如果帐号密码cookie存在则填充
        if (getCookie('username') && getCookie('password')) {
            oUser.value = getCookie('username');
            let oPswd2 = base.decode(getCookie('password'));
            oPswd.value = oPswd2;
            oRemember.checked = true;
        }
        //复选框勾选状态发生改变时,如果未勾选则清除cookie
        oRemember.onchange = function() {
            if (!this.checked) {
                delCookie('username');
                delCookie('password');
            }
        };
        //表单提交事件触发时,如果复选框是勾选状态则保存cookie
        oForm.onsubmit = function() {
            debugger;
            if (oRemember.checked) {
                setCookie('username', oUser.value, 7); //保存帐号到cookie,有效期7天
                let oPswd1 = base.encode(oPswd.value);
                setCookie('password', oPswd1, 7); //保存密码到cookie,有效期7天
            }
        };
    };
    //设置cookie
    function setCookie(name, value, day) {
        var date = new Date();
        date.setDate(date.getDate() + day);
        document.cookie = name + '=' + value + ';expires=' + date;
    };
    //获取cookie
    function getCookie(name) {
        var reg = RegExp(name + '=([^;]+)');
        var arr = document.cookie.match(reg);
        if (arr) {
            return arr[1];
        } else {
            return '';
        }
    };
    //删除cookie
    function delCookie(name) {
        setCookie(name, null, -1);
    };
    //加密解密Base64
    function Base64() {

        // private property
        _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

        // public method for encoding
        this.encode = function (input) {
            var output = "";
            var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
            var i = 0;
            input = _utf8_encode(input);
            while (i < input.length) {
                chr1 = input.charCodeAt(i++);
                chr2 = input.charCodeAt(i++);
                chr3 = input.charCodeAt(i++);
                enc1 = chr1 >> 2;
                enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
                enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
                enc4 = chr3 & 63;
                if (isNaN(chr2)) {
                    enc3 = enc4 = 64;
                } else if (isNaN(chr3)) {
                    enc4 = 64;
                }
                output = output +
                    _keyStr.charAt(enc1) + _keyStr.charAt(enc2) +
                    _keyStr.charAt(enc3) + _keyStr.charAt(enc4);
            }
            return output;
        }

        // public method for decoding
        this.decode = function (input) {
            var output = "";
            var chr1, chr2, chr3;
            var enc1, enc2, enc3, enc4;
            var i = 0;
            input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
            while (i < input.length) {
                enc1 = _keyStr.indexOf(input.charAt(i++));
                enc2 = _keyStr.indexOf(input.charAt(i++));
                enc3 = _keyStr.indexOf(input.charAt(i++));
                enc4 = _keyStr.indexOf(input.charAt(i++));
                chr1 = (enc1 << 2) | (enc2 >> 4);
                chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
                chr3 = ((enc3 & 3) << 6) | enc4;
                output = output + String.fromCharCode(chr1);
                if (enc3 != 64) {
                    output = output + String.fromCharCode(chr2);
                }
                if (enc4 != 64) {
                    output = output + String.fromCharCode(chr3);
                }
            }
            output = _utf8_decode(output);
            return output;
        }

        // private method for UTF-8 encoding
        _utf8_encode = function (string) {
            string = string.replace(/\r\n/g,"\n");
            var utftext = "";
            for (var n = 0; n < string.length; n++) {
                var c = string.charCodeAt(n);
                if (c < 128) {
                    utftext += String.fromCharCode(c);
                } else if((c > 127) && (c < 2048)) {
                    utftext += String.fromCharCode((c >> 6) | 192);
                    utftext += String.fromCharCode((c & 63) | 128);
                } else {
                    utftext += String.fromCharCode((c >> 12) | 224);
                    utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                    utftext += String.fromCharCode((c & 63) | 128);
                }

            }
            return utftext;
        }

        // private method for UTF-8 decoding
        _utf8_decode = function (utftext) {
            var string = "";
            var i = 0;
            var c = c1 = c2 = 0;
            while ( i < utftext.length ) {
                c = utftext.charCodeAt(i);
                if (c < 128) {
                    string += String.fromCharCode(c);
                    i++;
                } else if((c > 191) && (c < 224)) {
                    c2 = utftext.charCodeAt(i+1);
                    string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                    i += 2;
                } else {
                    c2 = utftext.charCodeAt(i+1);
                    c3 = utftext.charCodeAt(i+2);
                    string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
                    i += 3;
                }
            }
            return string;
        }
    }
</script>
</body>
</html>

 

posted @ 2021-10-22 16:20  moppet蔡蔡  阅读(69)  评论(0编辑  收藏  举报