实现view的扩展架构；调整think-view依赖；发布新版本

extend/base/admin/view/login/ext/demo.html

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+<div class="layui-btn layui-btn-xs" id="demo-login-btn">演示账号一键填写</div>
+<script>
+    $('#demo-login-btn').click(function() {
+        $('[name="username"]').val('admin')
+        $('[name="password"]').val('123456')
+    })
+</script>

extend/base/admin/view/login/index.html

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+<link rel="stylesheet" href="__STATIC__/admin/css/login.css?v={$version}" media="all">
+<div class="main-body">
+    <div class="login-main">
+        <div class="login-top">
+            <span>{:sysconfig('site','site_name')}</span>
+            <span class="bg1"></span>
+            <span class="bg2"></span>
+        </div>
+        <form class="layui-form login-bottom">
+            <div class="demo{if !$demo} layui-hide{/if}">用户名:admin 密码:123456</div>
+            <div class="center">
+
+                <div class="item">
+                    <span class="icon icon-2"></span>
+                    <input type="text" name="username" lay-verify="required" placeholder="请输入登录账号" maxlength="24" />
+                </div>
+
+                <div class="item">
+                    <span class="icon icon-3"></span>
+                    <input type="password" name="password" lay-verify="required" placeholder="请输入密码" maxlength="20">
+                    <span class="bind-password icon icon-4"></span>
+                </div>
+
+                {if $captcha == 1}
+                <div id="validatePanel" class="item" style="width: 137px;">
+                    <input type="text" name="captcha" placeholder="请输入验证码" maxlength="4">
+                    <img id="refreshCaptcha" class="validateImg" src="{:url('login/captcha')}" onclick="this.src='{:url(\'login/captcha\')}?seed='+Math.random()">
+                </div>
+                {/if}
+
+            </div>
+            <div class="tip">
+                <span class="icon-nocheck"></span>
+                <span class="login-tip">保持登录</span>
+                {:event_view_replace('<a href="javascript:" class="forget-password">忘记密码？</a>','AdminLoginForget')}
+                {:event_view_replace_js('AdminLoginForget')}
+
+            </div>
+            <div class="layui-form-item" style="text-align:center; width:100%;height:100%;margin:0px;">
+                <button class="login-btn" lay-submit>立即登录</button>
+            </div>
+            <div class="layui-form-item" style="padding: 10px;text-align: right;">
+                <div class="layui-btn-container">
+                    {:event_view_content("AdminLoginType")}
+                </div>
+            </div>
+        </form>
+    </div>
+</div>
+<div class="footer">
+    {:sysconfig('site','site_copyright')}<span class="padding-5">|</span><a target="_blank" href="http://www.miitbeian.gov.cn">{:sysconfig('site','site_beian')}</a>
+</div>

extend/base/admin/view/login/index.js

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+$(function () {
+    if (top.location !== self.location) {
+        top.location = self.location;
+    }
+
+    $('.bind-password').on('click', function () {
+        if ($(this).hasClass('icon-5')) {
+            $(this).removeClass('icon-5');
+            $("input[name='password']").attr('type', 'password');
+        } else {
+            $(this).addClass('icon-5');
+            $("input[name='password']").attr('type', 'text');
+        }
+    });
+
+    $('.icon-nocheck').on('click', function () {
+        if ($(this).hasClass('icon-check')) {
+            $(this).removeClass('icon-check');
+        } else {
+            $(this).addClass('icon-check');
+        }
+    });
+
+    $('.login-tip').on('click', function () {
+        $('.icon-nocheck').click();
+    });
+
+    ua.listen(function (data) {
+        data['keep_login'] = $('.icon-nocheck').hasClass('icon-check') ? 1 : 0;
+        return data;
+    }, function (res) {
+        ua.msg.success(res.msg, function () {
+            window.location = ua.url('index');
+        });
+    }, function (res) {
+        ua.msg.error(res.msg, function () {
+            $('#refreshCaptcha').trigger("click");
+        });
+    });
+
+    ua.triggerEventReplaceJs('AdminLoginForget', () => {
+        $('.forget-password').click(function () {
+            layer.msg('可以使用重置密码命令设置:<br/>php think admin:reset:password<br><a target="_blank" href="http://doc.ulthon.com/home/read/ulthon_admin/reset_password/15/16.html"> 参考文档</a>');
+        });
+    }, (code) => {
+        eval(code);
+    });
+});