DOM 
    1.type:                  
    2.target:                
    3.stopPropagation():     
    4.preventDefault():      
        

             
        
        
            document.getElementById("btn1").addEventListener("click",showType);
            document.getElementById("div").addEventListener("click",showDiv);
            function showType(event){
                //alert(event.type);
                alert(event.target);
                event.stopPropagation();// 
            }
            function showDiv(){
                alert("div");
            }
        

브라우저 객체 번호

        window.innerWidth     
        window.innerHeight    
        window.open()    
            window.open("index.html"," "," ");
        window.close()   

         ：
        setInterval() 
        clearInterval() setInterval() 
         
        

        
            var myTime = setInterval(function(){
                getTime();
            },1000);
            function getTime(){
                var d = new Date();
                var t = d.toLocaleTimeString();
                document.getElementById("ptime").innerHTML = t;
            }
            function stopTime(){
                clearInterval(myTime);
            }
        
        setTimeout() 
        clearTimeout() setTimeout() 

3.History对象

        window.history  (url) 
         ：
            history.back()       
            history.forward()    
            history.go()         
        EXP:
             
            
                function goceshi(){
                    history.back();
                }
            

        window.location  (url), 
         ：
            location.hostname        web 
            location.pathname        
            location.port            web 
            location.protocol        web (http:// https://)
            location.href            URL
            location.assign()        
            window.location.hostname;
            location.assign(url);

        window.screen  
         ：
            screen.availWidth        
            screen.availHeight       
            screen.Height            
            screen.Width             
            
                document.write(" :"+screen.availHeight+", :"+screen.availWidth);
                document.write(" :"+screen.height+", :"+screen.width);