Running javascript code only once -

i have piece of js code & want run once. js code contains if statement

if( abc.xyz && xyz.pqr) { //do } 

now, abc.xyz & xyz.pqr third party functions being called twice third party code on page & hence jscode have written runs twice. have no control on third party functions. need use them in js code , want code run once. tried using code below not work me:

var donethestuff;      if(!donethestuff){     donethestuff= true;     //my code     // code fires pixel can see in charles     // because of third party functions called twice on page     // code runs twice & drops 2 pixels instead of 1 can see in charles.     } 

any suggestions?

you can user underscore.js once() method this.

var dostuff = _.once(function() {   if( abc.xyz && xyz.pqr) {     //do   } }); 

and if want know how works, can browse source yourself:

http://underscorejs.org/docs/underscore.html#section-73

  _.once = function(func) {     var ran = false, memo;     return function() {       if (ran) return memo;       ran = true;       memo = func.apply(this, arguments);       func = null;       return memo;     };   };