增加功能：移动端增加滑块验证码 link #IRWNP

#Issue
https://gitee.com/LongbowEnterprise/dashboard/issues?id=IRWNP

Bootstrap.Admin/wwwroot/css/login-responsive.css

@@ -33,6 +33,12 @@
         padding: 0;
         margin: 36px 0 0 370px;
         width: 280px;
-        height: 200px;
+    }
+
+    .slidercaptcha {
+        top: -254px;
+        left: -15px;
+        width: 310px;
+        height: 280px;
     }
 }

Bootstrap.Admin/wwwroot/css/login.css

@@ -14,6 +14,7 @@
 
 .login-wrap {
     padding: 20px;
+    height: 270px;
 }
 
     .login-wrap .rememberPwd {
@@ -57,14 +58,13 @@
 
 .slidercaptcha {
     display: none;
-    position: relative;
-    bottom: 254px;
     background-color: #00adec;
-    width: 310px;
-    height: 280px;
     border-radius: 4px;
-    left: -10px;
     box-shadow: 0 0 10px #fff;
+    left: 0;
+    right: 0;
+    top: -232px;
+    height: 234px;
 }
 
     .slidercaptcha canvas:first-child {

Bootstrap.Admin/wwwroot/js/login.js

@@ -58,15 +58,17 @@
     });
 
     $('button[type="submit"]').on('click', function(e){
-        if ($.browser.versions.mobile) return true;
+        //if ($.browser.versions.mobile) return true;
         $captcha.addClass('d-block');
         return false;
     });
 
     $('#captcha').sliderCaptcha({
-        //setSrc: function() {
-        //    return '../images/pic/280/150/Pic' + Math.round(Math.random() * 136) + '.jpg'
-        //},
+        width: $(window).width() < 768 ? 216 : 280,
+        height: $(window).width() < 768 ? 110 : 150,
+        setSrc: function() {
+            return '../images/pic/280/150/Pic' + Math.round(Math.random() * 136) + '.jpg'
+        },
         onSuccess: function () {
             $('form').submit();
         }