它不显示Not Found，它显示undefinedfunction checkObj(obj, checkprob) { if (obj.hasOwnProperty) { return obj[checkprob]; } else { return "Not Found" }}console.log(checkObj({ gift: "pony", pet: "kitten", bed: "sleigh"}, "Amir"))
3 回答
互换的青春
TA贡献1797条经验 获得超6个赞
您使用hasOwnProperty错误：
function checkObj(obj, checkprob){
if(obj.hasOwnProperty(checkprob)){
return obj[checkprob];
} else{
return "Not Found";
}
}
console.log(checkObj({gift: "pony", pet: "kitten", bed: "sleigh"}, "Amir"));
console.log(checkObj({gift: "pony", pet: "kitten", bed: "sleigh"}, "bed"));
一只甜甜圈
TA贡献1836条经验 获得超5个赞
hasOwnProperty是一种方法，它需要一个参数。你必须这样称呼它hasOwnProperty(checkprob)。另请参阅文档。
function checkObj(obj, checkprob) {
if (obj.hasOwnProperty(checkprob)) {
return obj[checkprob];
} else {
return "Not Found"
}
}
console.log(checkObj({
gift: "pony",
pet: "kitten",
bed: "sleigh"
}, "Amir"))
UYOU
TA贡献1878条经验 获得超4个赞
缺少函数调用。您也可以使用in运算符。
function checkObj(obj, checkprob){
if(obj.hasOwnProperty(checkprob)){
return obj[checkprob];
} else{
return "Not Found";
}
}
function checkObj2(obj, checkprob) {
if (checkprob in obj) {
return obj[checkprob];
} else {
return "Not Found";
}
}
console.log(
checkObj2(
{
gift: "pony",
pet: "kitten",
bed: "sleigh"
},
"Amir"
)
);
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