js代码

<script src="js/jquery-1.11.0.min.js" type="text/javascript"></script>
	<script>

	var $output = $(".output"),
	    $display = $(".display"),
	    timer, coord = ["t","rt","lt","b","rb","lb","l","r"];

	function isPrime(n) {

	  var i = 2, n = n || 1;
	  if ( n === 1 ) { return false; }
	  if ( n < 4 ) { return true; }
	    
	  while( i < n ) {
	    if ( n % i === 0 ) { return false; }
	    i++;
	  }
	  return true;
	    
	}

	function outputPrime(n, c) {
	    if(n) {
	        $output.append("<i class='prime" + c + "'>" + n + "</i>");
	    }
	}

	function outputNormal(n) {
	    if(n) {
	        $output.append("<i>" + n + "</i>");
	    }
	}

	function display(n, prime, c) {
	            
	    var $temp, pos;
	    if(n) {

	        $display.text(n);
	        console.log(arguments);

	        if(prime) {

	            pos = Math.floor(Math.random()*coord.length);
	            
	            $temp = $display
	                .clone()
	                .addClass("prime c" + c)
	                .insertAfter( $display );
	        
	            setTimeout(function() {
	                $temp
	                    .addClass("out")
	                    .addClass(coord[pos]);
	            }, 10);
	            
	            setTimeout(function() {
	                $temp.remove();
	            }, 1200);

	        }
	    }
	}



	var n = 0,
	    work, scroll, 
	    paused = true;

	function calcPrimes() {

	    var c, p;
	    clearInterval(work);
	    work = setInterval(function() {
	        
	        c = Math.floor(Math.random()*6);
	        p = isPrime(n);

	        if( !p ) { 
	            outputNormal(n); 
	            display(n, p, c);
	        } else { 
	            outputPrime(n, c);
	            display(n, p, c);
	        }
	        
	        n++;
	    }, 33 );

	}
	function pauseWork() {
	    clearInterval(work);
	}

	function scrollWindow() {
	    
	    scroll = setInterval(function() {
	        $("body").animate({
	            "scrollTop": $("body").height()-80
	        }, 200 );
	    }, 2000 );
	    
	}
	function pauseScroll() {
	    clearInterval(scroll);
	}


	$(".control").on("click", function() {
	    
	    if( paused ) {
	        scrollWindow();
	        calcPrimes();
	        $(".control")
	            .addClass("play")
	            .removeClass("pause");
	    } else {
	        pauseScroll();
	        pauseWork();
	        $(".control")
	            .addClass("pause")
	            .removeClass("play");
	    }
	    
	    paused = !paused;
	    
	}).trigger("click");
	</script>