extjs decode response text of connection’s callback

we offen use a connection to lauch a request and get a response. the response text is a json string. how to decode it?

var conn = Ext.create(‘Ext.data.Connection’);
conn.request({
url : ‘addWare.action’,
callback : function(options, success, response) {
var responseArray = Ext.JSON.decode(response.responseText);
if(success){
alert(responseArray.id);
}else{
Ext.Msg.alert(“错误”, responseArray.msg);
}
}
});

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