我试图在函数运行后控制变量fullName,但它没有改变值,只是控制默认值NotSet,这是为什么?functionTest(){this.clientData={fullName:"NotSet",setUserName:function(firstName,lastName){this.fullName=firstName+""+lastName;},getUserInput2:function(firstName,lastName,callback){callback(firstName,lastName);}};this.getUserInput1=function(first