1. 判断打印多少;
for(var i=0;i<10;i++){setTimeout(function(){console.log(new Date,i)},1000);}console.log(new Date,i);
2.input 的过滤功能;
来源: http://www.qdfuns.com/note/22335/eb0a0387f8e1d26060f83465cd77c603.html