前端面试题目

1 如何将arguments转化为真正的数组？

2 写出以下代码打印结果

if([]==false){console.log(1);}; //1

if({}==false){console.log(2);}; //undefined

if([]){console.log(3);}; //3

if([1]==[1]){console.log(4);};  //undefined

 

3  写出以下代码打印结果

async function async1(){
    console.log("async1 start");
    await async2();
    console.log("async1 end");
}
async function async2(){
  console.log("async2");
}
console.log("script start");

setTimeout(function(){
  console.log("setTimeout");
},0);
async1();

new Promise(function(resolve){
  console.log("promise1");
  resolve();
  }).then(function(){
    console.log("promise2");
});
console.log("script end");

　　

参考链接：

https://www.zhihu.com/question/27981152