extjs 同步和异步请求

同步方式请求：

var conn = Ext.lib.Ajax.getConnectionObject().conn;

conn.open("GET", 'your url',false);

conn.send(null);

alert(conn.responseText);

或者

var conn = Ext.lib.Ajax.getConnectionObject().conn;
conn.open("POST", url, false);
conn.send("发送到服务器端的信息");
data = conn.responseText;
alert(data);

关键是要设置false这个参数

异步方式请求：

Ext.Ajax.request({

url : 'listpublishersms.action',

success : function(response, options) {

var temp = "<chart caption='" + startField.getValue().dateFormat("Y-m-d") + "至"

+ endField.getValue().dateFormat("Y-m-d") + "' baseFontSize='12' formatNumberScale='0' showBorder='1'>";

var responseArray = Ext.util.JSON .decode(response.responseText);

alert(responseArray.list.length);

for (var i = 0;i < responseArray.list.length ;i++) {

var pname = responseArray.list[i].pname;

var count = responseArray.list[i].count;

temp += "<set label='" + pname + "' value='" + count + "'/>";

}

temp += "</chart>";

chart_chart.setDataXML(temp);

}

});