jQuery.extend重载合并

使用：

var people1 = {
  apple: 0,
  banana: { weight: 52, price: 100 },
  age: 97
};
var people2 = {
  banana: { price: 200 },
  age: 100
};

jQuery.extend(people1,people2);
//或$.extend(people1,people2););
//或var c=$.extend(people1,people2););

people1的内容变为：{apple:0,banana{price:200},age:100}