actionscript-3中的乘法条件不起作用

Question

When i try to make a multiply condition. it's always error. can you tell me where my fault? Thanks

var score:Number = 0;

addEventListener(Event.ENTER_FRAME, totalScore);

function totalScore(e:Event){
    if(
        to_konten1_1.visible = false &&
        to_konten1_2.visible = false &&
        to_konten1_3.visible = false &&
        to_konten1_4.visible = false &&
        to_konten1_5.visible = false &&
        score > 20){
            gotoAndStop(2);
    } else if(
        to_konten1_1.visible = false &&
        to_konten1_2.visible = false &&
        to_konten1_3.visible = false &&
        to_konten1_4.visible = false &&
        to_konten1_5.visible = false &&
        score < 20){
            gotoAndStop(3);
        }

Answer 1

I think this worth explaining a bit. The if (condition) expression needs condition to be Boolean but does not require so. Instead, it tries to cast the given expression by the number of rules to get its Boolean value.

Boolean : A => A.

Assignation operator " = ": A=B => B.

null , undefined , void : always false .

Number , int , uint : 0 => false , Number.NaN => false , otherwise true .

String : "" => false , otherwise true .

Listing : A,B,C => C, although this expression has no particular meaning in AS3 it always returns its last element.

Any valid Array , Object , Function , Class or class instance: always true .

Thus, in your case you could formalize it a bit:

function totalScore(e:Event):void
{
    if (!anyVisible)
    {
        if (score > 20)
        {
            gotoAndStop(2);
        }
        else if (score < 20)
        {
            gotoAndStop(3);
        }
        else // if score == 20
        {
            // Decide what to do.
        }
    }
}

function get anyVisible():Boolean
{
    var aList:Array = [to_konten1_1, to_konten1_2, to_konten1_3, to_konten1_4, to_konten1_5];

    for each (var DO:DisplayObject in aList)
    {
        if (DO.visible)
        {
            return true;
        }
    }

    return false;
}

Answer 2

错误是您使用单个=进行分配，而不是使用双==进行比较。