Extjs shows the problem after the time taken from the database is converted to JSON

The time taken from the database in the background is formatted in JSON format and then transmitted to gridpanel. The time is changed to the format of/Date (32331121223)/. Then, the following processing is required for normal display:
In Copy codeThe Code is as follows: var record = Ext. data. Record. create ([
{Name: 'publicdate', mapping: 'publicdate', dateFormat: 'Y-m-d', convert: function (v ){
If (v = null ){
Return null;
}
Var d = new Date ();
Var str = v. toString ();
Var str1 = str. replace ("/Date (","");
Var str2 = str1.replace (")/","");
Var dd = parseInt (str2 );
D. setTime (dd );
Return d;
}}
]);

Then in:Copy codeThe Code is as follows: var cm = new Ext. grid. ColumnModel ([
{Header: 'publication time', dataIndex: 'publicdate', width: 120, align: 'center', renderer: Ext. util. format. dateRenderer ('Y-m-d ')}
]);

This will display normally, for example, 2012-11-19,