diff --git a/app/src/main/assets/sample/界面/登录界面.js b/app/src/main/assets/sample/界面/登录界面.js
new file mode 100644
index 00000000..7b36b181
--- /dev/null
+++ b/app/src/main/assets/sample/界面/登录界面.js
@@ -0,0 +1,58 @@
+"ui";
+
+ui.statusBarColor("#000000")
+showLoginUI();
+
+//显示登录界面
+function showLoginUI(){
+    ui.layout(`
+      <frame>
+        <vertical h="auto" align="center" margin="0 50">
+          <linear>
+             <text w="56" gravity="center" color="#111" size="16">用户名</text>
+             <input id="name" w="*" h="40"/>
+          </linear>
+          <linear>
+             <text w="56" gravity="center" color="#111" size="16">密码</text>
+             <input id="password" w="*" h="40" inputType="password"/>
+          </linear>
+          <linear gravity="center">
+             <button id="login" text="登录"/>
+             <button id="register" text="注册"/>
+          </linear>
+        </vertical>
+      </frame>
+    `);
+
+    ui.login.click(() => {
+       toast("您输入的用户名为" + ui.name.text() + " 密码为" + ui.password.text());
+    });
+    ui.register.click(() => showRegisterUI());
+}
+
+//显示注册界面
+function showRegisterUI(){
+    ui.layout(`
+      <frame>
+        <vertical h="auto" align="center" margin="0 50">
+          <linear>
+             <text w="56" gravity="center" color="#111" size="16">用户名</text>
+             <input w="*" h="40"/>
+          </linear>
+          <linear>
+             <text w="56" gravity="center" color="#111" size="16">密码</text>
+             <input w="*" h="40" inputType="password"/>
+          </linear>
+          <linear>
+             <text w="56" gravity="center" color="#111" size="16">邮箱</text>
+             <input w="*" h="40" inputType="email"/>
+          </linear>
+          <linear gravity="center">
+             <button>确定</button>
+             <button id="cancel">取消</button>
+          </linear>
+        </vertical>
+      </frame>
+    `);
+    ui.cancel.click(() => showLoginUI());
+}
\ No newline at end of file
diff --git a/autojs/src/main/assets/modules/__ui__.js b/autojs/src/main/assets/modules/__ui__.js
index 4de71eb2..fb274637 100644
--- a/autojs/src/main/assets/modules/__ui__.js
+++ b/autojs/src/main/assets/modules/__ui__.js
@@ -1,5 +1,6 @@
 module.exports = function(__runtime__, scope){
     var ui = Object(__runtime__.ui);
+    ui.__id_cache__ = {};
 
     ui.layout = function(xml){
         view = ui.inflate(activity, xml);
@@ -8,6 +9,7 @@ module.exports = function(__runtime__, scope){
 
     ui.setContentView = function(view){
         ui.view = view;
+        ui.__id_cache__ = {};
         activity.setContentView(view);
     }
 
@@ -31,6 +33,13 @@ module.exports = function(__runtime__, scope){
         __runtime__.getUiHandler().postDelay(action, delay);
     }
 
+    ui.statusBarColor = function(color){
+        if(typeof(color) == 'string'){
+            color = android.graphics.Color.parseColor(color);
+        }
+        activity.getWindow().setStatusBarColor(color);
+    }
+
     function decorate(view){
         var view = Object.create(view);
         view._id = function(id){
@@ -59,10 +68,14 @@ module.exports = function(__runtime__, scope){
          },
          get: function(name, start) {
             if(!ui[name]){
-                var widget = ui.id(name);
-                if(widget){
-                    ui[name] = widget;
-                    return widget;
+                var cacheView = ui.__id_cache__[name];
+                if(cacheView){
+                    return cacheView;
+                }
+                cacheView = ui.id(name);
+                if(cacheView){
+                    ui.__id_cache__[name] = cacheView;
+                    return cacheView;
                 }
             }
             return ui[name];
diff --git a/autojs/src/main/java/com/stardust/autojs/engine/MultiLinePreprocessor.java b/autojs/src/main/java/com/stardust/autojs/engine/MultiLinePreprocessor.java
new file mode 100644
index 00000000..fab49337
--- /dev/null
+++ b/autojs/src/main/java/com/stardust/autojs/engine/MultiLinePreprocessor.java
@@ -0,0 +1,99 @@
+package com.stardust.autojs.engine;
+
+import android.support.annotation.VisibleForTesting;
+
+import com.stardust.autojs.engine.preprocess.AbstractProcessor;
+
+import java.io.Reader;
+import java.io.StringReader;
+
+/**
+ * Created by Stardust on 2017/5/15.
+ */
+
+public class MultiLinePreprocessor extends AbstractProcessor {
+
+    private static final int STATE_SINGLE_QUOTE_LITERAL = 0x00000001;
+    private static final int STATE_DOUBLE_QUOTE_LITERAL = 0x00000010;
+    private static final int STATE_MULTI_LINE = 0x00001100;
+
+    private int mState = 0;
+    private int mStateBeforeLiteral = 0;
+    private StringBuilder mNewScript;
+    private int mLastReturnCharPosition;
+    private int i;
+
+    @Override
+    protected void handleChar(int ch) {
+        boolean shouldAppend = true;
+        switch (ch) {
+            case '"':
+                if (mState == STATE_DOUBLE_QUOTE_LITERAL) {
+                    mState = mStateBeforeLiteral;
+                } else if (mState != STATE_SINGLE_QUOTE_LITERAL) {
+                    mStateBeforeLiteral = mState;
+                    mState = STATE_DOUBLE_QUOTE_LITERAL;
+                }
+                break;
+            case '\'':
+                if (mState == STATE_SINGLE_QUOTE_LITERAL) {
+                    if ((mStateBeforeLiteral & STATE_MULTI_LINE) != 0) {
+                        mNewScript.append('\\');
+                    }
+                    mState = mStateBeforeLiteral;
+                } else if (mState != STATE_DOUBLE_QUOTE_LITERAL) {
+                    mStateBeforeLiteral = mState;
+                    mState = STATE_SINGLE_QUOTE_LITERAL;
+                    if ((mStateBeforeLiteral & STATE_MULTI_LINE) != 0) {
+                        mNewScript.append('\\');
+                    }
+                }
+                break;
+            case '`':
+                if (mState == 0) {
+                    mState = STATE_MULTI_LINE;
+                    mNewScript.append("'");
+                    shouldAppend = false;
+                } else if (mState == STATE_MULTI_LINE) {
+                    mState = 0;
+                    mNewScript.append("'");
+                    shouldAppend = false;
+                }
+                break;
+            case '\r':
+            case '\n':
+                if (ch == '\n' && mLastReturnCharPosition == i - 1) {
+                    shouldAppend = false;
+                    break;
+                }
+                if (ch == '\r')
+                    mLastReturnCharPosition = i;
+                if (mState == STATE_MULTI_LINE) {
+                    mNewScript.append("\\n'+\n'");
+                    shouldAppend = false;
+                }
+                break;
+        }
+        if (shouldAppend) {
+            mNewScript.append((char) ch);
+        }
+        i++;
+    }
+
+    @Override
+    public void reset() {
+        mState = 0;
+        mStateBeforeLiteral = 0;
+        mNewScript = new StringBuilder();
+        mLastReturnCharPosition = -2;
+        i = 0;
+    }
+
+    @Override
+    public Reader getReaderAndClear() {
+        Reader reader = new StringReader(mNewScript.toString());
+        mNewScript = null;
+        return reader;
+    }
+
+}
diff --git a/autojs/src/main/java/com/stardust/autojs/engine/RhinoJavaScriptEngine.java b/autojs/src/main/java/com/stardust/autojs/engine/RhinoJavaScriptEngine.java
index 7b086807..a59bb8db 100644
--- a/autojs/src/main/java/com/stardust/autojs/engine/RhinoJavaScriptEngine.java
+++ b/autojs/src/main/java/com/stardust/autojs/engine/RhinoJavaScriptEngine.java
@@ -2,6 +2,7 @@ package com.stardust.autojs.engine;
 
 import android.util.Log;
 
+import com.stardust.autojs.engine.preprocess.Preprocessor;
 import com.stardust.autojs.rhino_android.AndroidContextFactory;
 import com.stardust.autojs.rhino_android.RhinoAndroidHelper;
 import com.stardust.autojs.runtime.ScriptInterruptedException;
@@ -10,27 +11,23 @@ import com.stardust.pio.UncheckedIOException;
 
 import org.mozilla.javascript.Context;
 import org.mozilla.javascript.ContextFactory;
-import org.mozilla.javascript.ErrorReporter;
-import org.mozilla.javascript.EvaluatorException;
 import org.mozilla.javascript.ImporterTopLevel;
-import org.mozilla.javascript.ScriptRuntime;
 import org.mozilla.javascript.Scriptable;
 import org.mozilla.javascript.ScriptableObject;
 import org.mozilla.javascript.commonjs.module.RequireBuilder;
 import org.mozilla.javascript.commonjs.module.provider.SoftCachingModuleScriptProvider;
-import org.mozilla.javascript.xmlimpl.XMLLibImpl;
 
+import java.io.BufferedReader;
 import java.io.File;
 import java.io.IOException;
 import java.io.Reader;
+import java.io.StringReader;
 import java.net.URI;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
-import javax.xml.parsers.DocumentBuilderFactory;
-
 /**
  * Created by Stardust on 2017/4/2.
  */
@@ -38,6 +35,7 @@ import javax.xml.parsers.DocumentBuilderFactory;
 public class RhinoJavaScriptEngine implements ScriptEngine {
 
     private static final String LOG_TAG = "RhinoJavaScriptEngine";
+    private static final Preprocessor PREPROCESSOR = new MultiLinePreprocessor();
 
     private static int contextCount = 0;
     private String[] mRequirePath = new String[0];
@@ -62,17 +60,19 @@ public class RhinoJavaScriptEngine implements ScriptEngine {
 
     @Override
     public Object execute(ScriptSource source) {
-        Reader reader = source.getScriptReader();
-        if (reader == null) {
-            return mContext.evaluateString(mScriptable, source.getScript(), "<script>", 1, null);
-        }
+        Reader reader = source.getNonNullScriptReader();
         try {
-            return mContext.evaluateReader(mScriptable, source.getScriptReader(), "<script>", 1, null);
+            reader = preprocess(reader);
+            return mContext.evaluateReader(mScriptable, reader, "<script>", 1, null);
         } catch (IOException e) {
             throw new UncheckedIOException(e);
         }
     }
 
+    private Reader preprocess(Reader script) throws IOException {
+        return PREPROCESSOR.preprocess(script);
+    }
+
     @Override
     public void forceStop() {
         Log.d(LOG_TAG, "forceStop: interrupt Thread: " + mThread);
diff --git a/autojs/src/main/java/com/stardust/autojs/engine/preprocess/AbstractProcessor.java b/autojs/src/main/java/com/stardust/autojs/engine/preprocess/AbstractProcessor.java
new file mode 100644
index 00000000..44ab0378
--- /dev/null
+++ b/autojs/src/main/java/com/stardust/autojs/engine/preprocess/AbstractProcessor.java
@@ -0,0 +1,31 @@
+package com.stardust.autojs.engine.preprocess;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.Reader;
+
+/**
+ * Created by Stardust on 2017/5/15.
+ */
+
+public abstract class AbstractProcessor implements Preprocessor {
+
+    @Override
+    public Reader preprocess(Reader reader) throws IOException {
+        reset();
+        int ch;
+        if (!(reader instanceof BufferedReader))
+            reader = new BufferedReader(reader);
+        while ((ch = reader.read()) != -1) {
+            handleChar(ch);
+        }
+        return getReaderAndClear();
+    }
+
+    protected abstract void handleChar(int ch);
+
+    public abstract void reset();
+
+    public abstract Reader getReaderAndClear();
+
+}
diff --git a/autojs/src/main/java/com/stardust/autojs/engine/preprocess/Preprocessor.java b/autojs/src/main/java/com/stardust/autojs/engine/preprocess/Preprocessor.java
new file mode 100644
index 00000000..d702634b
--- /dev/null
+++ b/autojs/src/main/java/com/stardust/autojs/engine/preprocess/Preprocessor.java
@@ -0,0 +1,13 @@
+package com.stardust.autojs.engine.preprocess;
+
+import java.io.IOException;
+import java.io.Reader;
+
+/**
+ * Created by Stardust on 2017/5/15.
+ */
+
+public interface Preprocessor {
+
+    Reader preprocess(Reader reader) throws IOException;
+}
diff --git a/autojs/src/main/java/com/stardust/autojs/execution/ScriptExecuteActivity.java b/autojs/src/main/java/com/stardust/autojs/execution/ScriptExecuteActivity.java
index 1cb95fe3..2f83c081 100644
--- a/autojs/src/main/java/com/stardust/autojs/execution/ScriptExecuteActivity.java
+++ b/autojs/src/main/java/com/stardust/autojs/execution/ScriptExecuteActivity.java
@@ -3,6 +3,7 @@ package com.stardust.autojs.execution;
 import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
+import android.graphics.Color;
 import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
 
@@ -29,6 +30,7 @@ public class ScriptExecuteActivity extends AppCompatActivity {
         if (execution != null) {
             return null;
         }
+
         execution = new ActivityScriptExecution(service, task);
         context.startActivity(new Intent(context, ScriptExecuteActivity.class)
                 .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK));
diff --git a/autojs/src/main/java/com/stardust/autojs/runtime/api/AppUtils.java b/autojs/src/main/java/com/stardust/autojs/runtime/api/AppUtils.java
index 0e0e60d4..c45193b1 100644
--- a/autojs/src/main/java/com/stardust/autojs/runtime/api/AppUtils.java
+++ b/autojs/src/main/java/com/stardust/autojs/runtime/api/AppUtils.java
@@ -11,6 +11,7 @@ import android.support.annotation.Nullable;
 import com.stardust.autojs.runtime.ScriptInterface;
 import com.stardust.util.IntentUtil;
 
+import java.lang.ref.WeakReference;
 import java.util.List;
 
 /**
@@ -20,7 +21,7 @@ import java.util.List;
 public class AppUtils {
 
     private Context mContext;
-    private Activity mCurrentActivity;
+    private WeakReference<Activity> mCurrentActivity;
 
     public AppUtils(Context context) {
         mContext = context;
@@ -62,7 +63,7 @@ public class AppUtils {
 
     @Nullable
     public Activity getCurrentActivity() {
-        return mCurrentActivity;
+        return mCurrentActivity.get();
     }
 
     @ScriptInterface
@@ -72,6 +73,6 @@ public class AppUtils {
     }
 
     public void setCurrentActivity(Activity currentActivity) {
-        mCurrentActivity = currentActivity;
+        mCurrentActivity = new WeakReference<>(currentActivity);
     }
 }
diff --git a/autojs/src/test/java/com/stardust/autojs/engine/MultiLinePreprocessorTest.java b/autojs/src/test/java/com/stardust/autojs/engine/MultiLinePreprocessorTest.java
new file mode 100644
index 00000000..c6f49639
--- /dev/null
+++ b/autojs/src/test/java/com/stardust/autojs/engine/MultiLinePreprocessorTest.java
@@ -0,0 +1,77 @@
+package com.stardust.autojs.engine;
+
+import org.junit.Test;
+
+import java.io.Reader;
+import java.io.StringReader;
+
+import static org.junit.Assert.*;
+import static com.stardust.autojs.engine.MultiLinePreprocessor.*;
+
+/**
+ * Created by Stardust on 2017/5/15.
+ */
+public class MultiLinePreprocessorTest {
+
+
+    @Test
+    public void test1() throws Exception {
+        process("(`2\n3\n4`)0\n0");
+    }
+
+    @Test
+    public void test2() throws Exception {
+        process("(`\n23\n4`)0\n0");
+    }
+
+    @Test
+    public void test3() throws Exception {
+        process("(`\n1\n23\n`)0\n0");
+    }
+
+    @Test
+    public void test4() throws Exception {
+        process("(2`\n\"999\"\n3`)0\n0");
+    }
+
+    @Test
+    public void test5() throws Exception {
+        process("(2`\n\"99`99\"\n3`)0\n0");
+    }
+
+    @Test
+    public void test6() throws Exception {
+        process("(2`\n'999'\n3`)0\n0");
+    }
+
+    @Test
+    public void test7() throws Exception {
+        process("12'345\"6789'\n");
+    }
+
+    @Test
+    public void test8() throws Exception {
+        process("12\"345\"6789'\n\"'''");
+    }
+
+    @Test
+    public void test9() throws Exception {
+        process("(2`\n\"99`88'7799\"\n3`)0\n0");
+    }
+
+    @Test
+    public void test10() throws Exception {
+        process("(`\r\n1\r\n23\r\n`)0\r\n0");
+    }
+
+    private void process(String s) throws Exception {
+        MultiLinePreprocessor preprocessor = new MultiLinePreprocessor();
+        Reader reader = preprocessor.preprocess(new StringReader(s));
+        int ch;
+        while ((ch = reader.read()) != -1) {
+            System.out.print((char) ch);
+        }
+        System.out.println();
+    }
+
+}
\ No newline at end of file