diff --git a/app/src/main/java/io/legado/app/base/BaseViewModel.kt b/app/src/main/java/io/legado/app/base/BaseViewModel.kt
index 852e99166..1d6fed36a 100644
--- a/app/src/main/java/io/legado/app/base/BaseViewModel.kt
+++ b/app/src/main/java/io/legado/app/base/BaseViewModel.kt
@@ -2,35 +2,17 @@ package io.legado.app.base
 
 import android.app.Application
 import androidx.lifecycle.AndroidViewModel
-import kotlinx.coroutines.*
+import io.legado.app.help.coroutine.Coroutine
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.MainScope
+import kotlinx.coroutines.cancel
 import org.jetbrains.anko.AnkoLogger
 
 open class BaseViewModel(application: Application) : AndroidViewModel(application), CoroutineScope by MainScope(),
     AnkoLogger {
 
-
-    protected fun launchOnUI(
-        tryBlock: suspend CoroutineScope.() -> Unit,
-        errorBlock: (suspend CoroutineScope.(Throwable) -> Unit)? = null,//失败
-        finallyBlock: (suspend CoroutineScope.() -> Unit)? = null//结束
-    ) {
-        launch {
-            tryCatch(tryBlock, errorBlock, finallyBlock)
-        }
-    }
-
-    private suspend fun tryCatch(
-        tryBlock: suspend CoroutineScope.() -> Unit,
-        errorBlock: (suspend CoroutineScope.(Throwable) -> Unit)? = null,
-        finallyBlock: (suspend CoroutineScope.() -> Unit)? = null
-    ) {
-        try {
-            coroutineScope { tryBlock() }
-        } catch (e: Throwable) {
-            coroutineScope { errorBlock?.let { it(e) } }
-        } finally {
-            coroutineScope { finallyBlock?.let { it() } }
-        }
+    fun <T> execute(domain: suspend CoroutineScope.() -> T): Coroutine<T> {
+        return Coroutine.with<T>(this).execute(domain)
     }
 
     override fun onCleared() {
diff --git a/app/src/main/java/io/legado/app/help/coroutine/Coroutine.kt b/app/src/main/java/io/legado/app/help/coroutine/Coroutine.kt
index 2419afb4a..7eebfb59a 100644
--- a/app/src/main/java/io/legado/app/help/coroutine/Coroutine.kt
+++ b/app/src/main/java/io/legado/app/help/coroutine/Coroutine.kt
@@ -2,12 +2,12 @@ package io.legado.app.help.coroutine
 
 import kotlinx.coroutines.*
 
-class Coroutine<T>(private val domain: (suspend CoroutineScope.() -> T)? = null) : CoroutineScope by MainScope() {
+class Coroutine<T>(private val scope: CoroutineScope) {
 
     companion object {
 
-        fun <T> of(value: suspend CoroutineScope.() -> T): Coroutine<T> {
-            return Coroutine(value)
+        fun <T> with(scope: CoroutineScope): Coroutine<T> {
+            return Coroutine(scope)
         }
     }
 
@@ -16,24 +16,20 @@ class Coroutine<T>(private val domain: (suspend CoroutineScope.() -> T)? = null)
     private var error: ((Throwable) -> Unit)? = null
     private var finally: (() -> Unit)? = null
 
-    private var value: T? = null
-
-    init {
-        val job: Job = launch {
+    fun execute(domain: suspend CoroutineScope.() -> T): Coroutine<T> {
+        scope.launch {
             tryCatch(
                 {
                     start?.let { it() }
 
 
                     val result: T? = withContext(Dispatchers.IO) {
-                        domain?.let {
-                            value = it()
-                            return@let value
-                        }
+                        domain()
                     }
 
                     success?.let { it(result) }
 
+
                 },
                 { e ->
                     error?.let { it(e) }
@@ -42,20 +38,13 @@ class Coroutine<T>(private val domain: (suspend CoroutineScope.() -> T)? = null)
                     finally?.let { it() }
                 })
         }
+        return this@Coroutine
     }
 
     fun onStart(start: (() -> Unit)): Coroutine<T> {
         this.start = start
         return this@Coroutine
     }
-//
-//    fun <U> map(func: Function<T, U>): Coroutine<U> {
-//        return of { func.apply(value) }
-//    }
-//
-//    fun <U> flatMap(func: Function<T, Coroutine<U>>): Coroutine<U> {
-//        return func.apply(value)
-//    }
 
     fun onSuccess(success: (T?) -> Unit): Coroutine<T> {
         this.success = success
diff --git a/app/src/main/java/io/legado/app/help/coroutine/Function.kt b/app/src/main/java/io/legado/app/help/coroutine/Function.kt
deleted file mode 100644
index 78cea56db..000000000
--- a/app/src/main/java/io/legado/app/help/coroutine/Function.kt
+++ /dev/null
@@ -1,7 +0,0 @@
-package io.legado.app.help.coroutine
-
-interface Function<T, R> {
-
-    fun apply(t: T?): R
-
-}
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/search/SearchActivity.kt b/app/src/main/java/io/legado/app/ui/search/SearchActivity.kt
index 34914296d..b2f662875 100644
--- a/app/src/main/java/io/legado/app/ui/search/SearchActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/search/SearchActivity.kt
@@ -14,6 +14,7 @@ class SearchActivity : BaseActivity<SearchViewModel>() {
         get() = R.layout.activity_search
 
     override fun onViewModelCreated(viewModel: SearchViewModel, savedInstanceState: Bundle?) {
+        viewModel.search()
     }
 
 }
diff --git a/app/src/main/java/io/legado/app/ui/search/SearchViewModel.kt b/app/src/main/java/io/legado/app/ui/search/SearchViewModel.kt
index c2466b084..acdc64c86 100644
--- a/app/src/main/java/io/legado/app/ui/search/SearchViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/search/SearchViewModel.kt
@@ -7,13 +7,9 @@ import androidx.lifecycle.MutableLiveData
 import io.legado.app.base.BaseViewModel
 import io.legado.app.data.api.CommonHttpApi
 import io.legado.app.data.entities.SearchBook
-import io.legado.app.help.coroutine.Coroutine
-import io.legado.app.help.coroutine.Function
 import io.legado.app.help.http.HttpHelper
-import kotlinx.coroutines.*
-import kotlinx.coroutines.Dispatchers.IO
+import kotlinx.coroutines.delay
 import org.jetbrains.anko.error
-import java.lang.StringBuilder
 
 class SearchViewModel(application: Application) : BaseViewModel(application) {
 
@@ -37,11 +33,13 @@ class SearchViewModel(application: Application) : BaseViewModel(application) {
 //            { error { "${it.message}" } },
 //            { finally?.let { it() } })
 
-       val task =  Coroutine.of {
+        execute {
             val response: String = HttpHelper.getApiService<CommonHttpApi>(
                 "http://www.baidu.com"
             ).get("http://www.baidu.com").await()
 
+            delay(4000L)
+
             Log.e("TAG1", Thread.currentThread().name)
 
             response
@@ -50,7 +48,7 @@ class SearchViewModel(application: Application) : BaseViewModel(application) {
                 Log.e("TAG!", "start")
             }
             .onSuccess {
-               Log.e("TAG!", "success: $it")
+                Log.e("TAG!", "success: $it")
             }
             .onError {
                 error { "${it.message}" }
@@ -59,7 +57,6 @@ class SearchViewModel(application: Application) : BaseViewModel(application) {
                 Log.e("TAG!", "finally")
             }
 
-//        task.cancel()
     }
 
 }