单项选择题 async function testAsync() { return "hello async";}let result = testAsync();console.log(result)输出结果是（）

单项选择题 async function print(){ return 1;}print().then(e => console.log(e)); 输出（）

单项选择题 async function t(){ var a = new Promise( function (resolve, reject) { console.log(1); resolve(9); console.log(2); }) var b = new Promise( function (resolve, reject) { console.log(3); resolve(8); console.log(4); }) console.log(5); b=await b; a=await a; console.log(b); console.log(a); console.log(6);}t();console.log(7);//代码打印结果是什么？（）