반복문 4가지

1. for .. in

// Initialize object.
a = {"a" : "Athens" , "b" : "Belgrade", "c" : "Cairo"}
 
// Iterate over the properties.
var s = ""
for (var key in a) {
    s += key + ": " + a[key];
    s += "<br />";
}
document.write (s);
 
// Output:
// a: Athens
// b: Belgrade
// c: Cairo

2. for

var array = ['A', 'B', 'C', 'D'];
 
for(var i=0; i<array.length; i++) {
    alert(array[i]);
}

3. while

var value = 0;
while(value < 4) {
    alert(value + '번');
    value++;
}

4. do..while

var value = 0;
do {
    alert(value + '번');
    value++;
} while(value < 5);