jquery遍历json键值对

var jsonStr = {"customer_name":"大发粮油加工厂","customer_id":"1","y":"45646","stop_date":"2030-01-01 00:00:00.0","data_guid":"13sd13f1s3df3s1f6s6df1s6d","start_date":"2013-01-15 00:00:00.0","x":"123"};
$.each(jsonStr,function(i){
var key = i;
var value = jsonStr[i];
alert(key+":"+value);
});