遗漏的类型错误：无法读取的不确定

Question

我试图创建此对象编程产权“球员”：

var data = { 
    "player0": { 
    "name":  "kahn", 
    "pos":  "gk", 
    "ability": "best", 
    "unsure": 0, 
    "waiting": 1 
    }, 
    "player1": { 
    "name" : "recoba", 
    "pos":  "cmf", 
    "ability": "inter", 
    "unsure": 1, 
    "waiting": 0 
    } 
}; 

这是我的尝试，但我得到的标题显示的错误：

var test; 
test.player.name = "kahn"; 
test.player.pos = "gk"; // enough properties for testing 
console.log(test); 

我该怎么做？

Answer 1

，直到你创建对象本身不能分配对象属性：

var test = {}; 
test.player = {}; 
test.player.name = "kahn"; 
... 
console.log(JSON.stringify(test)); 

或者：

var test = {}; 

test.player = {name: "kahn", pos: "gk"}; 
console.log(JSON.stringify(test)); 

或者：

var test = []; 

var player1 = {name: "kahn", pos: "gk"}; 
var player2 = {name: "recoba", pos: "cmf"}; 

test.push(player1); 
test.push(player2); 
console.log(JSON.stringify(test)); 

或者：

var test = {}; 

test.player0 = {name: "kahn", pos: "gk"}; 
test.player1 = {name: "recoba", pos: "cmf"}; 

console.log(JSON.stringify(test)); 

注意：后者对应于你的对象结构，有问题。

或者：

var test = {}; 

for (var i = 0; i < 5; i++) { 
    test["player" + i] = {"name": "player " + i}; 
    ... 
} 

console.log(JSON.stringify(test));