SOURCE

var obj1 = {
   'name' : 'zhangsan',
   'age' :  '18',
   'language' : [1,[2,3],[4,5]],
};
var obj2=obj1;
obj2.name = "lisi";
obj2.language[1] = ["二","三"];
console.log('obj1',obj1)  //obj1,{"name":"lisi","age":"18","language":[1,["二","三"],[4,5]]}
console.log('obj2',obj2)  //obj2,{"name":"lisi","age":"18","language":[1,["二","三"],[4,5]]}



// 浅拷贝
var obj1 = {
   'name' : 'zhangsan',
   'age' :  '18',
   'language' : [1,[2,3],[4,5]],
};
var obj3 = shallowCopy(obj1);
obj3.name = "lisi";
obj3.language[1] = ["二","三"];
function shallowCopy(src) {
   var dst = {};
   for (var prop in src) {
       if (src.hasOwnProperty(prop)) {
           //console.log(src)
          // console.log(prop)
          // console.log(src.hasOwnProperty(prop))
           dst[prop] = src[prop];
       }
   }
   console.log(dst)
   return dst;
}
console.log('obj1',obj1) //obj1,{"name":"zhangsan","age":"18","language":[1,["二","三"],[4,5]]}
console.log('obj3',obj3) //obj3,{"name":"lisi","age":"18","language":[1,["二","三"],[4,5]]}