我正在尝试遍历一组对象并获取第一个值(品种)。喜欢:
现在,我在数据上进行了映射,但它只列出了每个{}。如何访问每个{}的内部?
const data = [
{
"breed": "Beagle",
"characteristics": "playful"
},
{
"breed": "Golden Retriever",
"characteristics": "calm"
},
{
"breed": "Corgi",
"characteristics": "bright"
},
{
"breed": "Goldendoodle",
"characteristics": "gentle"
},
{
"breed": "Labrador Retriever",
"characteristics": "loyal"
},
]
data.map(item => {
console.log(item);
})
// Object { breed: "Beagle", characteristics: "playful" }, Object { breed: "Golden Retriever", characteristics: "calm" }, ...
要获得品种,请breed
从每个项目中提取。
const data = [{"breed":"Beagle","characteristics":"playful"},{"breed":"Golden Retriever","characteristics":"calm"},{"breed":"Corgi","characteristics":"bright"},{"breed":"Goldendoodle","characteristics":"gentle"},{"breed":"Labrador Retriever","characteristics":"loyal"}];
const res = data.map(({ breed }) => breed);
console.log(res);
ES5语法:
var data = [{"breed":"Beagle","characteristics":"playful"},{"breed":"Golden Retriever","characteristics":"calm"},{"breed":"Corgi","characteristics":"bright"},{"breed":"Goldendoodle","characteristics":"gentle"},{"breed":"Labrador Retriever","characteristics":"loyal"}];
var res = data.map(function(item) {
return item.breed
});
console.log(res);
如果只想记录每个项目,请使用forEach
循环:
const data = [{"breed":"Beagle","characteristics":"playful"},{"breed":"Golden Retriever","characteristics":"calm"},{"breed":"Corgi","characteristics":"bright"},{"breed":"Goldendoodle","characteristics":"gentle"},{"breed":"Labrador Retriever","characteristics":"loyal"}];
data.forEach(({ breed }) => console.log(breed));
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