将图标与对象关联

Question

Is it possible to associate an image as an attribute with an Object in Javascript like this? So far I have not been able to get it to work.

var spy={
  name: "Spy",
  life: true,
  voting: true,
  icon: new Image();
}
icon.src = "Images/testImage";

Answer 1

When you want to access or modify an object's property, you can't just access the property name directly. You'll have to access an object property like this:

var spy={
  name: "Spy",
  life: true,
  voting: true,
  icon: new Image()
};
spy.icon.src = "Images/testImage";

Otherwise, if you had several "spy" objects, how were the JavaScript compiler to know which one's property you want to change?

There was also a syntax error (well, actually two):

1. the semicolon behind new Image() . You do not need and simply cannot put a semicolon in an object declaration that way.
2. you should however add a semicolon after the closing curly bracket, as it's a variable declaration.

Answer 2

You need to access the src property by spy.icon.src

var spy={
  name: "Spy",
  life: true,
  voting: true,
  icon: new Image()
};
spy.icon.src = "Images/testImage";

If you try to access the src property like icon.src = "Images/testImage"; you will get an error

"Uncaught ReferenceError: icon is not defined"

as the icon is not declared or refered anywhere in the code. icon is a property of the spy object.