javascript - Simultaneous setIntervals - only first one running -


i'm designing web page has moving clouds in background. code uses jquery , looks this.

browserwidth = 0; browserheight = 0; clouds = 4;  cloudspeed = 50;  $(function() {       browserwidth = $(window).width();     browserheight =  $(window).height();      for(i = 0; < clouds; i++) {         createcloud(cloudspeed);     } });  function movecloud(cloud) {     offset = cloud.offset();     posx = offset.left;     posx--;      if(posx < -250) {         posx = browserwidth;     }      cloud.offset({         left: posx     }); }  function createcloud(speed) {     posy = math.floor(math.random() * (browserheight / 2.5));     posx = math.floor(math.random() * (browserwidth - 255));      cloud = $("<div></div>").addclass("cloud").appendto("body").offset({         top: posy,         left: posx     });      setinterval(function() {         movecloud(cloud);     }, speed); }

basically uses createcloud function create fours clouds (divs background image) initializes div , sets interval using setinterval. in interval function call function movecloud moves div 1 pixel left. see code above.

my problem moves 1 of divs. i've read should okay use multiple intervals simultaneously.

what's wrong code?

the problem have one, global, cloud.

add var in front of declaration :

var cloud = $("<div></div>").addclass("cloud").appendto("body").offset({

when don't use var keyword, make variable global.


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