!439 调整closeSync方法，紧接着writeSync，readSync，防止打开的文件没有正确关闭

Merge pull request !439 from Madi/master

library/src/main/ets/utils/FileUtils.ets

@@ -58,8 +58,6 @@ export class FileUtils {
    * @returns
    */
   async deleteFile(path: string): Promise<void> {
-    // const isExist: boolean = await fs.access(path)
-    // if (isExist) {
     try {
       await fs.unlink(path)
     } catch (err) {
@@ -76,8 +74,7 @@ export class FileUtils {
   writeDataSync(path: string, content: ArrayBuffer | string): boolean {
     try {
       let fd = fs.openSync(path, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE | fs.OpenMode.TRUNC).fd
-      let stat = fs.statSync(path)
-      fs.writeSync(fd, content, { offset: stat.size })
+      fs.writeSync(fd, content)
       fs.closeSync(fd)
       return true
     }
@@ -150,9 +147,9 @@ export class FileUtils {
   readFileSync(path: string): ArrayBuffer | undefined {
     try {
       if (fs.accessSync(path)) {
-        let fd = fs.openSync(path, fs.OpenMode.READ_ONLY).fd;
         let length = fs.statSync(path).size
         let buf = new ArrayBuffer(length);
+        let fd = fs.openSync(path, fs.OpenMode.READ_ONLY).fd;
         fs.readSync(fd, buf)
         fs.closeSync(fd)
         return buf