位运算 （&|）与--或 一位数组表示多种意思～～ 与--或

var arr:Array = [0,1,2,4,8,16]

var gate:int = 0;

gate |= arr[1]
gate |= arr[2]
gate |= arr[3]

trace(gate)

trace(Boolean(gate&1))
trace(Boolean(gate&4))