$.getJSON("http://query.yahooapis.com/v1/public/yql?callback=?", {
q: "select * from json where url='http://baidu.kuaidi100.com/query?type=tiantian&postid=886511927358&id=4'",
format: "json"
}, function(data) {
var $content = $("#content")
if (data.query.results) {
var result = JSON.stringify(data.query.results);
alert(result);
$content.text(result);
var obj = eval('('+result+')');
alert(obj.json.message);
}
});