ext 解析后台返回response.responseText中的数据

Ext.Ajax.request({
url: "...",
method: "POST",
params: {
currentID: mainNode.attributes.id
},
success: function (response) {

var resp =  Ext.decode(response.responseText )；

resp.totalCount;

}
}); //ajax over

//响应中返回的

response.responseText : "{\"success\":\"true\",\"totalCount\":\"0\", \"root\":[]}"

通过Ext.decode(response.responseText);可以把返回的字符串转成对象

//decode后的效果

Ext.decode(response.responseText ) : {…}

root : []

success : "true"

totalCount : "0"