Question

有人可以解释为什么我的循环中未定义吗？我试图运行一个循环，让我知道如果我看到的东西以及评级是真的。我做错了什么？

var films = [

{
    movie: "fast and the furious",
    rating: 4,
    seen: true
},
{
    movie:"13 reasons why",
    rating: 5,
    seen: true


}, 
{
    movie:"beaty and the beast",
    rating: 4,
    seen: false
}

];

films.forEach(function(movie){
var result = "You have ";
if(movie.seen) {
    result += "watched ";
} 
else{
    result += "not seen ";
}
result += "\"" + films.movie + "\" - ";
result += films.rating + " stars";

console.log(result);

});

Answer 1

您应该在迭代器函数中访问元素，而不是数组：

films.forEach(function(movie) {
  var result = "You have ";
  if (movie.seen) {
    result += "watched ";
  } else {
    result += "not seen ";
  }
  result += "\"" + movie.movie + "\" - ";
  result += movie.rating + " stars";
});

Answer 2

您在函数中传递了一个movie参数。你应该用它来获得结果。

＆＃13;

var films = [

{
    movie: "fast and the furious",
    rating: 4,
    seen: true
},
{
    movie:"13 reasons why",
    rating: 5,
    seen: true


}, 
{
    movie:"beaty and the beast",
    rating: 4,
    seen: false
}

];

films.forEach(function(movie){
var result = "You have ";
if(movie.seen==true) {
    result += "watched ";
}else{
    result += "not seen ";
}
result += "\"" + movie.movie + "\" - ";
result += movie.rating + " stars";

console.log(result);

});

＆＃13;

Answer 3

＆＃13;

foreach

＆＃13;

使用其他变量输入{{1}}并使用相同的变量来读取属性。

来自foreach循环的未定义值

3 个答案: