你必须知道的Javascript知识点之"单线程事件驱动"的使用_javascript技巧

 var intervalBody = function(){
     console.log('interval');
 }

 var startInterval = function(){
     setInterval(intervalBody,1000);
 }

 var timeoutBody = function(){
     console.log('timeout');
 }

 var startTimeout = function(){
     setTimeout(timeoutBody,1000);
 }

 var sleep = function(second){
     var current = new Date().setSeconds(new Date().getSeconds() + second);
     while(new Date()  }

 startInterval();
 startTimeout();
 sleep(2);
 console.log('sleep once');
 sleep(2);
 console.log('sleep again');

var sleep = function(second){
     var current = new Date().setSeconds(new Date().getSeconds() + second);
     while(new Date()  }

 document.body.innerHTML = '段光伟';
 sleep(5);