hasOwnProperty没有正确返回？
问题描述：
为什么这个函数返回'No Contact'而不是'Akira'？hasOwnProperty没有正确返回？
function lookUpProfile(firstName, prop){
for(i=0;i<contacts.length;i++){
if(contacts[i].hasOwnProperty.prop){
return firstName;
}
return 'no contact' ;
}
}
var contacts = [
{
"firstName": "Akira",
"lastName": "Laine",
"number": "0543236543",
"likes": ["Pizza", "Coding", "Brownie Points"]
},
{
"firstName": "Harry",
"lastName": "Potter",
"number": "0994372684",
"likes": ["Hogwarts", "Magic", "Hagrid"]
},
{
"firstName": "Sherlock",
"lastName": "Holmes",
"number": "0487345643",
"likes": ["Intriguing Cases", "Violin"]
},
{
"firstName": "Kristian",
"lastName": "Vos",
"number": "unknown",
"likes": ["Javascript", "Gaming", "Foxes"]
}
];
console.log(lookUpProfile("Akira", "likes"));
答
你需要在你的prop以作为参数传递。
function lookUpProfile(firstName, prop){
for(i=0;i<contacts.length;i++){
if(contacts[i].hasOwnProperty(prop)){
return firstName;
}
return 'no contact' ;
}
}
var contacts = [
{
"firstName": "Akira",
"lastName": "Laine",
"number": "0543236543",
"likes": ["Pizza", "Coding", "Brownie Points"]
},
{
"firstName": "Harry",
"lastName": "Potter",
"number": "0994372684",
"likes": ["Hogwarts", "Magic", "Hagrid"]
},
{
"firstName": "Sherlock",
"lastName": "Holmes",
"number": "0487345643",
"likes": ["Intriguing Cases", "Violin"]
},
{
"firstName": "Kristian",
"lastName": "Vos",
"number": "unknown",
"likes": ["Javascript", "Gaming", "Foxes"]
}
];
console.log(lookUpProfile("Akira", "likes"));
答
尝试
contacts[i].hasOwnProperty(prop)
'如果（联系人[I] .hasOwnProperty（丙））' – James
因为'hasOwnProperty'功能没有所谓的属性'道具'。 – melpomene