var indexOuterLoop, iterationsOuterLoop = 1000, indexInnerLoop, iterationsInnerLoop = 100;

outer:
for (indexOuterLoop = 0; indexOuterLoop < 1000; indexOuterLoop++)
{
     inner:
     for (indexInnerLoop = 0; indexInnerLoop < iterationsInnerLoop; indexInnerLoop++)
     {
        if (indexInnerLoop === 10)
        {
            console.log( 'indexInnerLoop is equals to 10' );
            break outer;
        }
     }
}

console.log( indexOuterLoop );  // Should log 0.

assert(items[0] === 'indexInnerLoop is equals to 10' && items[1] === 0);

var items = [];
var backConsole = console;
var counter
var console = {
    log: function (str) {
        items.push(str);
        counter++;
        if(counter === 2){
            console = backConsole;
        }
    }
};