Javascript计时器 - donghua-li的博客 - CSDN博客

setInterval(code,millisec); 
code:可以是方法名，如果是方法不要加小括号。同时也可以是字符串用双引号将方法括起来。setInterval(“setCode（）”,1000);或者setInterval(setCode,1000); 
millisec:是毫秒数,就是隔了多久执行

 var p1 = document.getElementById("p");    
 var n = 0;    
 var data = ["4234","343440"];    
 var rows = 0;    
 var cols = 0;    
 function setCode(){
        if(cols < data[rows].length){
            p1.innerHTML += data[rows][cols];
            cols++;
        }else if(rows < data.length){
            p1.innerHTML += "</br>";
            rows++;
            cols = 0;
        }else {
            clearInterval(timer);
        }
    }    var timer = setInterval(setCode,500);

   var person = {name: "peng", age: 23};    
   function getPerson(person){
        alert(person.name);
    }    var timer = setInterval(function(){
        getPerson(person);
    },1000);