如果你有一个数组,例如
var people = [
{ "name": "bob", "dinner": "pizza" },
{ "name": "john", "dinner": "sushi" },
{ "name": "larry", "dinner": "hummus" }
];
您可以使用filter https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/filter数组对象的方法:
people.filter(function (person) { return person.dinner == "sushi" });
// => [{ "name": "john", "dinner": "sushi" }]
在较新的 JavaScript 实现中,您可以使用函数表达式:
people.filter(p => p.dinner == "sushi")
// => [{ "name": "john", "dinner": "sushi" }]
您可以搜索有以下情况的人"dinner": "sushi"
用一个map https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/map
people.map(function (person) {
if (person.dinner == "sushi") {
return person
} else {
return null
}
}); // => [null, { "name": "john", "dinner": "sushi" }, null]
or a reduce https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/reduce
people.reduce(function (sushiPeople, person) {
if (person.dinner == "sushi") {
return sushiPeople.concat(person);
} else {
return sushiPeople
}
}, []); // => [{ "name": "john", "dinner": "sushi" }]
我相信您能够将其推广到任意键和值!