jquery遍歷json鍵值對

var jsonStr = {"customer_name":"大發糧油加工廠","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);  
});