登录ui按钮支持JavaScript (#2558)

* LoginUI button supports running JavaScript

* Update jsHelp.md

* Update ruleHelp.md

app/src/main/assets/help/jsHelp.md

@@ -107,12 +107,12 @@ java.getVerificationCode(imageUrl)
 java.longToast(msg: Any?)
 java.toast(msg: Any?)
 ```
-* 从网络(由java.cacheFile实现)、本地导入JavaScript脚本
+* 从网络(由java.cacheFile实现)、本地读取JavaScript文件，导入上下文请手动`eval(String(...))`
 ```
-{{java.importScript(url)}}
+java.importScript(url)
 //相对路径支持android/data/{package}/cache
-{{java.importScript(relativePath)}}
+java.importScript(relativePath)
-{{java.importScript(absolutePath)}}
+java.importScript(absolutePath)
 ```
 * 缓存网络文件
 ```
@@ -293,7 +293,7 @@ cookie.getCookie(url)
 获取cookie某一键值
 cookie.getKey(url,key)
 删除cookie
-cookie.removeCookie(key)
+cookie.removeCookie(url)
 ```
 
 ## cache对象的部分可用函数

app/src/main/assets/help/ruleHelp.md

@@ -37,6 +37,11 @@
         name: "注册",
         type: "button",
         action: "http://www.yooike.com/xiaoshuo/#/register?title=%E6%B3%A8%E5%86%8C"
+    },
+    {
+        name: "获取验证码",
+        type: "button",
+        action: "java.ajax(...)"
     }
 ]
 成功登录后在js中获取读取登录信息

app/src/main/java/io/legado/app/ui/login/SourceLoginDialog.kt

@@ -67,6 +67,15 @@ class SourceLoginDialog : BaseDialogFragment(R.layout.dialog_login, true) {
                     it.root.onClick {
                         if (rowUi.action.isAbsUrl()) {
                             context?.openUrl(rowUi.action!!)
+                        } else {
+                            // JavaScript
+                            rowUi.action?.let {
+                                kotlin.runCatching {
+                                    source.evalJS(it)
+                                }.onFailure {
+                                    AppLog.put("LoginUI Button ${rowUi.name} JavaScript error", it)
+                                }
+                            }
                         }
                     }
                 }