在 ActionScript 3 中，如何将循环中数组的当前值传递给事件侦听器
问题描述：
代码示例:
var gospels : Array = ["john", "mark", "matthew", "paul"];
for each (var book : String in gospels)
{
var loader : URLLoader = new URLLoader();
loader.load(new URLRequest("http://example.com/" + name));
trace(book) // outputs current value of array
loader.addEventListener(Event.COMPLETE, function(e : Event) : void {
trace(book); // prints paul 4 times
});
}
当事件侦听器的函数被调用时，如何让事件侦听器在循环中使用数组的值?IE.当我在事件侦听器的函数中调用 trace 时，如何让它输出 "john", "mark", "matthew",和 "paul"?
How can I get the event listener to use the value of the array in the loop when the event listener's function was called? I.e. when I call trace inside the event listener's function, how can I get it to output "john", "mark", "matthew", and "paul"?
答
var gospels:Array = ["john", "mark", "matthew", "paul"];
for each (var item:String in gospels)
{
(function(book:String){
var loader : URLLoader = new URLLoader();
loader.load(new URLRequest("http://example.com/" + name));
trace(book) // outputs current value of array
loader.addEventListener(Event.COMPLETE, function(e:Event):void {
trace(book); // prints paul 4 times
});
}(item));
}