Introduction to common methods of cloning objects and arrays in js_javascript skills

Two cloning methods of Ext:

You can clone objects, data, etc.: var newJson = Ext.clone(json);
You can only clone arrays: var newJson = Ext. Array.clone(json);

JQuery method:

Deep copy [can be iterated]: var newJson = jQuery.extend(true,{}, json) ;
Shallow copy [cannot iterate]: var newJson = jQuery.extend({}, json);

var newJson = $.map(json,function (n) { return n; });

Clone method of array:

Copy code The code is as follows:

var newJson = json.concat();
var newJson = json.splice(0);

The above methods all copy a new one Object or array, but if you directly access the object of the parent window through parent [iframe situation], there will be problems [there is a reference relationship]. It should be noted that you can change the method of fetching to the method of passing data.