SOURCE

var obj = getSomeObject(); // { name: 'wallace' }

var output = hanxiaofengsheng(obj);
// obj --> { name: 'wallace', mo: true }
console.log(obj.name,obj.mo);
console.log(output.name,output.mo);
function getSomeObject(){
  var thisObj = new Object();
  thisObj.name="wallow";
  return thisObj;
}
function hanxiaofengsheng (input) {
  var copy = input; // 试图进行所谓"对象复制"
 // console.log(copy instanceof input);
  copy.mo = true;   // 引用类型属性修改, 外部变量受影响
  return copy;
}