测试js并发执行

gistfile1.js

var sleep = function(t){
	//console.log(+new Date());
	var t1 = +new Date();
	while(+new Date() - t1 < t){
	
	}
	//console.log(+new Date());
}
var f = function(x){
	sleep(Math.random() * 1000);
	console.log(x);
}
for(var i = 0; i < 100; i++){
	setTimeout(f(i),0);
}

js是单线程，所以以上代码还是会顺序输出0-99