function?person(firstname,lastname,age,eyecolor){
????this.firstname=firstname;
????this.lastname=lastname;
????this.age=age;
????this.eyecolor=eyecolor;
????this.changeName=changeName;
function?changeName(name){
this.lastname=name;
}
}
myMother=new?person("Sally","Rally",48,"green");
myMother.changeName("Doe");
document.write(myMother.lastname);下面代碼中，如果說this指向調(diào)用它的函數(shù)，那么下面的this不是指向changeName.那么changeName.lastname不是undifined么。 function?changeName(name){
this.lastname=name;
}
關(guān)于this的問題.
鏡花以西映陵東4076133
2016-10-27 13:10:58
