个回答

• Tracy_

  2015-01-28 13:53:01

  如果是 var a = b = new Object();  a,b指向的是同一个引用。

  
  

  var a = b = new Object();

  a.name = "Tom";

  b.age = 20;

  console.log(a); // {"name":"Tom", "age":20}

  console.log(b); // {"name":"Tom", "age":20}

  console.log(a === b) // true

  1

• Jinbaooooo

  2015-01-26 21:50:30

  console.log(typeof a); //undefined
  

  console.log(typeof b); //Object

  
  

  这种写法只是把 b 指向了一个Object

  并未定义 a 

  0