JavaScript闭包

    
    
    
    
     
    
    
    
    
    



  
    

      
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                    本次上网时长00:00:00
                
            
       
   
    

$(function() {
	var num = $("#count-down span b").text();
	var timer;
	countDown(num);
	$(".jump").click(function() {
		jump();
	})
	//判断倒计时
	function countDown(n) {
		if(n>0){
			setTimeout(function(){
				n--;
				$("#count-down span b").text(n);
				countDown(n);
			},1000)
		}else {
			jump();
		}
	};

	function jump() {
		$("#count-down").fadeOut(800);
		if(timer){
			clearInterval(timer);
		}
		timer = setInterval(setClock,1000);
		
	}
	//记录上网时长
	var h=0,m=0,s=0,str="";
	function setClock() {
		str="";
		if(++s == 60){
			if(++m== 60){
				h++;
				m=0;
			}
			s=0;
		}
		/*if(s<10){
			str+='0'+s;
		}else {
			str+=s;
		};*/
		str += h<10?'0'+h:h;
		str += ":";
		str += m<10?'0'+m:m;
		str += ":";
		str += s<10?'0'+s:s;
		$("#ptime").text(str);
	}
})