diff --git a/README.md b/README.md
index 16397637c16d79fa23575bb1ec055e30ddf9cdca..ab966948f1fa1a37688d4eaec0780111ea87f918 100644
--- a/README.md
+++ b/README.md
@@ -37,7 +37,7 @@
 
 ## 约束与限制
 
-1. 本示例仅支持标准系统上运行，支持设备：华为手机。
+1. 本示例仅支持预览器运行。
 
 2. HarmonyOS系统：HarmonyOS 6.0.0 Release及以上。
 
diff --git a/entry/src/main/ets/pages/BasicPage.ets b/entry/src/main/ets/pages/BasicPage.ets
index 3da3d043ef565cc7212fc2bbb78f6b87ba1b06b0..7a5ea8157f0a6bf821bf049ae1c55bcf22f2f08b 100644
--- a/entry/src/main/ets/pages/BasicPage.ets
+++ b/entry/src/main/ets/pages/BasicPage.ets
@@ -74,13 +74,29 @@ function referenceTypes() {
   let o1: Object = 'Alice';
   let o2: Object = ['a', 'b'];
   let o3: Object = 1;
-  console.log(`o1: ${o1.toString()}`);
-  console.log(`o2: ${o2.toString()}`);
-  console.log(`o3: ${o3.toString()}`);
+  console.log(`o1: ${o1}`);
+  console.log(`o2: ${o2}`);
+  console.log(`o3: ${o3}`);
+
+  let strObject: String = new String('ArkTS');
+  let obj: Object = 'ArkTS';
+  let str: string = 'ArkTS';
+  console.log(`${str.length}`);
+  console.log(`${str.indexOf('T')}`);
+  console.log(`strObject: ${strObject}`);
+  console.log(`obj: ${obj}`);
 
   // Array
   let students: string[] = ['XiaoMing', 'XiaoZhang', 'XiaoWang', 'XiaoLi'];
   console.log(students[0]); // Get element at index 0.
+  students.push('XiaoHong');
+  students.pop();
+
+  let arr1: number[] = [1, 2];
+  let arr2: number[] = arr1;
+  arr2.push(3);
+  console.log(`arr1: ${arr1}`);
+  console.log(`arr2: ${arr2}`);
 }
 
 referenceTypes();
@@ -105,7 +121,7 @@ function typeSystem() {
   // Type Aliases.
   type Matrix = number[][]; // Define alias Matrix for a 2D array.
   let arr: Matrix = [[1, 2, 3]];
-  console.log(`arr: ${arr.toString()}`);
+  console.log(`arr: ${arr}`);
 
   type NullableObject = Object | null; // Define alias NullableObject for a nullable object.
   let obj: NullableObject = null;
@@ -217,7 +233,7 @@ function nullSafety() {
   let x: number | null = null;
   x = 1; // ok.
   x = null; // ok.
-  if (x != null) {
+  if (x !== null) {
     // ...
   }
 }
@@ -225,7 +241,7 @@ function nullSafety() {
 nullSafety();
 
 function nullSafetyWithIf(name: string | null) {
-  if (name != null) {
+  if (name !== null) {
     // ...
   }
 }
@@ -282,11 +298,19 @@ function showSwitchStatements() {
   let day = 6;
   switch (day) {
     case 1:
+      console.log('Monday');
+      break;
     case 2:
+      console.log('Tuesday');
+      break;
     case 3:
+      console.log('Wednesday');
+      break;
     case 4:
+      console.log('Thursday');
+      break;
     case 5:
-      console.log('Weekday');
+      console.log('Friday');
       break;
     case 6:
     case 7:
@@ -443,9 +467,6 @@ function makeMilkTeaWithoutReturnType(flavor: string, sweetness: string) {
 }
 
 makeMilkTeaWithoutReturnType('strawberry', 'half sugar');
-// Function scope.
-let outerVar = 'I am outer';
-console.log(`out func: ${outerVar}`);
 
 function hi1() {
   console.info('hi1');
@@ -458,11 +479,15 @@ function hi2(): void {
 hi1();
 hi2();
 
+// Function scope.
+let outerVar = 'I am outer';
+
 function func() {
   let outerVar = 'I am inside';
   console.log(outerVar);
 }
 
+console.log(outerVar);
 func();
 
 @Entry
diff --git a/entry/src/main/ets/pages/BubbleSortPage.ets b/entry/src/main/ets/pages/BubbleSortPage.ets
index d2f57694a5347607c31394710d24295506122f1e..adbbd6ff287bc169715d4c234970306e7c32c019 100644
--- a/entry/src/main/ets/pages/BubbleSortPage.ets
+++ b/entry/src/main/ets/pages/BubbleSortPage.ets
@@ -28,7 +28,7 @@ function BubbleSort(arr: number[]): number[] {
 }
 
 let result = BubbleSort([85, 92, 78, 95, 88, 60, 72]);
-console.log(result.toString());
+console.log(`${result}`);
 
 @Entry
 @Component
diff --git a/entry/src/main/ets/pages/DaffodilsNumberPage.ets b/entry/src/main/ets/pages/DaffodilsNumberPage.ets
index cd827030892053b476a5eff27b3a322934604b90..24f35970f53b6528c7d37f1a2e0659fd8047e6c6 100644
--- a/entry/src/main/ets/pages/DaffodilsNumberPage.ets
+++ b/entry/src/main/ets/pages/DaffodilsNumberPage.ets
@@ -17,7 +17,7 @@ function DaffodilsNumber() {
   let result: number[] = [];
   for (let i = 100; i < 1000; i++) {
     let unitsDigit: number = i % 10;
-    let tenthsDigit: number = Math.floor(i / 10) - Math.floor(i / 100) * 10;
+    let tenthsDigit: number = Math.floor(i / 10) % 10;
     let hundredthsDigit: number = Math.floor(i / 100);
     if (i === unitsDigit * unitsDigit * unitsDigit + tenthsDigit * tenthsDigit * tenthsDigit +
       hundredthsDigit * hundredthsDigit * hundredthsDigit) {
@@ -28,7 +28,7 @@ function DaffodilsNumber() {
 }
 
 let daffodilsNumberResult = DaffodilsNumber();
-console.log(daffodilsNumberResult.toString());
+console.log(`${daffodilsNumberResult}`);
 
 @Entry
 @Component
diff --git a/entry/src/main/ets/pages/MultiplicationTablePage.ets b/entry/src/main/ets/pages/MultiplicationTablePage.ets
index bb171159c3bc70faf135c17a1a5dd97bf95de4fb..abc64a193e0b9dedd26e70fc42e08bcb399aac59 100644
--- a/entry/src/main/ets/pages/MultiplicationTablePage.ets
+++ b/entry/src/main/ets/pages/MultiplicationTablePage.ets
@@ -14,8 +14,8 @@
  */
 // Print 9x9 multiplication table.
 function MultiplicationTable() {
+  let result = '';
   for (let i = 1; i <= 9; i++) {
-    let result = '';
     for (let j = 1; j <= i; j++) {
       let temp: string = j + ' * ' + i + ' = ' + i * j;
       result += temp;
diff --git a/oh-package.json5 b/oh-package.json5
index c72aa05d549507e5ea6ce0bc0a8080c450508c7d..96463c34a1d8fb87fe2b01d9e47f510104e035cc 100644
--- a/oh-package.json5
+++ b/oh-package.json5
@@ -3,8 +3,5 @@
   "description": "Please describe the basic information.",
   "dependencies": {
   },
-  "devDependencies": {
-    "@ohos/hypium": "1.0.24",
-    "@ohos/hamock": "1.0.0"
-  }
+  "devDependencies": {}
 }