extend整合
ex1.
var obj1 = { name: 'bob', age: 18, hobby: 'read' };
var obj2 = { name: 'jimmy', gender: 'Male' };
var newObj1 = $.extend(obj1, obj2);
console.log( obj1 );
console.log( obj2 );
console.log( newObj1 );
IE11下的结果：
ex2.
var obj1 = { name: 'bob', age: 18, hobby: 'read' };
var obj2 = { name: 'jimmy', gender: 'Male' };
var newObj2 = $.extend( {}, obj1