jQuery变量阴影

var obj1 = {
  name: "John",
  sayHello: function() {
    var name = "John";
    console.log("Hello, " + name);
  }
};

var obj2 = {
  name: "Jane",
  sayHello: function() {
    var name = "Jane";
    console.log("Hello, " + name);
  }
};

obj1.sayHello(); // Output: Hello, John
obj2.sayHello(); // Output: Hello, Jane