function forTest(){
  var val = 0;
  for(var i=0;i<10;i++){
    if(i == 5){
      continue;
    }
    if(i == 8){
      break;
    }
    val++;
  }
  alert(val);
}

function whileTest1(){
  var val = 0;
  var i=0;

  while(++i <= 10){
    val++;
  }
  alert(val);
}

function whileTest2(){
  var val = 0;
  var i=0;

  do{
    val++;
  }while(++i <= 10);
  alert(val);
}

function inTest(){
  var array= new Array();
  array.push(1);
  array.push(2);
  array.push(3);
  array.push(4);
  array.push(5);

  var sum = 0;
  for(var i in array){
    sum += array[i];
  }
  alert(sum);
}