Javascript获取属性值

Question

我的问题是：

作品：

console.log(variable[apple]);

variable: {
  apple : "xxx"
}

不工作：

console.log(variable.element[apple]);

variable: {
  element: {
    apple: "xxx"
  }
}

element 不是未定义的。 有什么想法吗？

Answer 1

variable: {  //this is a code block labeled "variable"
  element: {  //this is a code block labeled "element"
    apple: "xxx"  //this is an expression "xxx" labeled as "apple"
  }
}

但是您的代码中没有变量。阅读labeled statements

你可能是说

var variable = {  //now this is a variable containing an object
  element: {  //and these are properties of that object
    apple: "xxx"  
  }
}

console.log(variable.element.apple);