var v1:Array = ["a", "b", "c", "d"];
for(var i:String in v1) {
    trace(i+"|"+v1[i]); //0|a
}
for each (var propertyValue:String in v1) {
    trace(propertyValue); //a
}
/*
id|1
age|19
name|lisi
*/
var v2:Object = {id:1, name:'lisi', age:19}; //for var i 是map中的key-value的key，而arr[i]指的是value，
for(var i in v2) {
    trace(i+"|"+v2[i]); //经测试，输出顺序无规律
}
for each (var propertyValue in v2) {  //for each是取出value。
    trace(propertyValue); // 1 19 lisi
}
trace(v2["name"]); //lisi