如何实现一个 sleep 函数

1. Atomics

   	 function sleep(n) {
   		Atomics.wait(new Int32Array(new SharedArrayBuffer(4)), 0, 0, n);
   	 }
    

   用法：

   	console.time('test');
   	sleep(2000)
   	console.timeEnd('test');
   

2. Promise

   	function sleep(ms){
   	    return new Promise((resolve)=>{
   	        setTimeout(resolve,ms)
   	    })
   	}
    

   用法：

   	console.time('test');
   	sleep(2000).then(()=>{
   	    console.timeEnd('test');
   	})