HarmonyOS 如何跨har访问resfile文件？

//demo 
export function fnc() { 
  const context = getContext(); 
  let filePath = context.resourceDir+'/config.json'; 
  let readTextOptions: ReadTextOptions = { 
    offset: 1, 
    length: 0, 
    encoding: 'utf-8' 
  }; 
  let stat = fs.statSync(filePath); 
  readTextOptions.length = stat.size; 
  let str = fs.readTextSync(filePath, readTextOptions); 
  console.info("readText succeed:" + str); 
}