如何在构造函数中创建数组？

Question

I want to create a new array as an attribute of the object once I create a new instance. But I get the following error in Chrome: "Uncaught TypeError: Cannot call method 'push' of undefined". Players seems to be unkown. But why?

function Team(name) {
    this.Name = name;
    this.Players = new Array();
}

Team.prototype.AddPlayer = new function (player) {
    this.Players.push(player); //error
}

Answer 1

只需删除此行中的“新”即可

Team.prototype.AddPlayer = function (player) {

Answer 2

Your code is correct, but you need to be sure to make a new Team instance using new .

var t = new Team("foo");
t.AddPlayer("bar");

---

Oops, one error in your code. Remove new from before function in the .prototype assignment.

function Team(name) {
    this.Name = name;
    this.Players = new Array();
}

Team.prototype.AddPlayer = /*new*/ function (player) {
    this.Players.push(player);
}

Because you had new before the function, you were actually using the anonymous function as a constructor , which means it was being invoked .

To be clear, new does not make a new function unless it is placed before the Function constructor.