Question

我有一个名为ary的数组和这个数组中的一些对象，它们是ary [0]，ary [1]，ary [2]，ary [3]和ary [4]。每个都有一个文本属性我希望为ary中的所有元素添加一个eventListener，并将该属性传递给一个函数。首先，我按如下方式执行：

    ary[0].addEventListener(MouseEvent.CLICK,function(e:MouseEvent){toGo(e,ary[0].topname.text)});
    ary[1].addEventListener(MouseEvent.CLICK,function(e:MouseEvent){toGo(e,ary[1].topname.text)});
    ary[2].addEventListener(MouseEvent.CLICK,function(e:MouseEvent){toGo(e,ary[2].topname.text)});
    ary[3].addEventListener(MouseEvent.CLICK,function(e:MouseEvent){toGo(e,ary[3].topname.text)});
    ary[4].addEventListener(MouseEvent.CLICK,function(e:MouseEvent){toGo(e,ary[4].topname.text)});

function toGo(e:MouseEvent,str:String){
   ......
}



it does work.But when I change it in for(...){...},it has an error.

for(var i=0;i<arylength;i++){
     ary[i].addEventListener(MouseEvent.CLICK,function(e:MouseEvent){toGo(e,ary[i].topname.text)});
     }     

for above code,I got an error "TypeError: Error #1010: A term is undefined and has no properties.".Then I also try another way.

for(var i=0;i<arylength;i++){ ary[i].addEventListener(MouseEvent.CLICK,function(e:MouseEvent){toGo(e,ary[i].topname.text)}); }

它没有错误，但我得到的变量“namestr”始终是ary中最后一个元素的变量。为什么呢？

我在哪里弄错了？

感谢。

Answer 1

你的第一个for循环，错误是ary和length之间的缺失时间。您有arylength，但应该是ary.length。

更好的方法是:(不使用匿名函数，使用事件的currentTarget属性来确定单击了哪个项目）

for(var i=0; i < ary.length; i++){
    ary[i].addEventListener(MouseEvent.CLICK,itemClick,false,0,true);
}   

function itemClick(e:Event):void {
    toGo(e, Object(e.currentTarget).topname.text;
    //replace the object cast with whatever type your ary items are
}

//or even better, just go right to the toGo function and figure out the item clicked there.

将变量传递给一个数组中对象的函数

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