how do an infinite loop in javascript

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An infinite while loop will block the main thread wich is equivalent to a crash.
You could use a selfcalling function ( wich leaves the main thread doing some other stuff inbetween):

(function main(counter){
    console.log(counter);
    setTimeout(main,0,counter+1);
})(0);

You can put a loop that goes from 0 to 100, and one that goes from 100 to 0 into it, without blocking the browser too much:

(function main(){
    for(var counter=0;counter<100;counter++){
       console.log(counter);
    }
   console.log(100);
    while(counter){
       console.log(--counter);
    }
    setTimeout(main,0);
})();

http://jsbin.com/vusibanuki/edit?console

Further research: JS IIFEs , function expression, non-blocking trough setTimeout …

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