ActionScript - 非类型变量的默认数据类型？

Question

如果我没有在我的代码中专门输入一个变量，它会编译为默认数据类型？例如，“每个...在”功能的效果最好，而无需输入变量：

for each (var element in myArray) 
     { 
     //process each element 
     } 

做我元素变量有数据类型？如果输入Object为实际编写元素：Object或者它有什么关系？

编辑

实际上，这是一个坏榜样，因为元素变量将被输入到任何元素是myArray的。

但它是如何工作的，如果一个变量是无类型的？它会变成什么传递给它？

这里是我的问题一个更好的例子：

var a = "i'm a string"; //does this var becomes a String? 

var b = 50.98; //does this var becomes a Number? 

var c = 2; //does this var becomes an int? 

Answer 1

for each (var element in myArray)

的element变量不具有任何数据类型 - 它是类型化的，因​​此可以容纳任何东西。

是的，它相当于编写element:Object或element:*，但总是建议您键入变量 - 这将帮助您在运行代码之前捕获一些错误。如果不这样做，mxmlc编译器将发出警告，可通过将其键入e:Object或e:*来修复该警告。

---

var a = 45.3; //untyped variable `a` 
a = "asd";  //can hold anything 

/* 
    This is fine: currently variable `a` contains 
    a String object, which does have a `charAt` function. 
*/ 
trace(a.charAt(1)); 

a = 23; 
/* 
    Run time error: currently variable `a` contains 
    a Number, which doesn't have a `charAt` function. 
    If you had specified the type of variable `a` when 
    you declared it, this would have been 
    detected at the time of compilation itself. 
*/ 
trace(a.charAt(1)); //run time error 


var b:Number = 45.3; 
b = "asd"; //compiler error 
trace(a.charAt(1)); //compiler error