how to keep the value of a variable in a closure

Question

i need to create multiple javascript functions which have a static id inside, so the function itself knows what data to process.

Here is some code:

(function(){
  function log(s){
    if(console && console.log) console.log(s);
    else alert(s);
  }
  var i = 10; while (i--){
    window.setTimeout(function(){
      // i need i to be 10, 9, 8... here not -1
      log(i);
    },500);
  }
})();

The problem ist that i allways gets updated by the loop, and i need to prevent this.

Thanks in advance for any help, comments or tips!

Answer 1

Just create a function and call it.

while (i--) {
    (function(i) {
        // use i here
    })(i);
}