JS如何获得JSON字段的长度

//JS 获得JSON 字典的长度的代码 
 
var jsonData = {"name":"txt1","name2":"txt2"}; 
 
function getJsonLength(jsonData) { 
 
 var jsonLength = 0; 
 
 for (var item in jsonData) { 
 
 jsonLength++; 
 
 } 
 
 return jsonLength; 
 
} 
 
console.log("json对象的长度为:",getJsonLength(jsonData));