使用多个键/值对查找JSON对象，然后更新该对象的其他属性 [英] Find JSON Object using multiple key/value pairs, then update that Object's other attribute

问题描述

给出

sessionStorage.cart = "[
  {"id":121,"name":"Pants","number":1,"specification":""},
  {"id":121,"name":"Pants","number":2,"specification":""},       
  {"id":121,"name":"Pants","number":3,"specification":""}
]"

我想编写一个函数，查找ID为121，裤子名称，数字2的对象，以便我可以更新该对象的规格.因此，我将传递id，名称，数字和所需的新规范值，并获得以下结果:

I'd like to write a function that finds the object with id of 121, name of Pants, number of 2, so that I can update that object's specification. So I would pass the id, the name, the number, and the desired new specification value, and get an output of this:

sessionStorage.cart = "[
  {"id":121,"name":"Pants","number":1,"specification":""},
  {"id":121,"name":"Pants","number":2,"specification":"new value"},       
  {"id":121,"name":"Pants","number":3,"specification":""}
]"

我真的很想通过欢迎指导来思考这一问题！

Am really struggling on thinking this one through... guidance welcome!

推荐答案

使用此:

var cart = [
    {
        "id": 121,
        "name": "Pants",
        "number": 1,
        "specification": ""
    },
    {
        "id": 121,
        "name": "Pants",
        "number": 2,
        "specification": ""
    },
    {
        "id": 121,
        "name": "Pants",
        "number": 3,
        "specification": ""
    }
];

cart.forEach(function(entry) {
    if (entry.id == 121 && entry.name == 'Pants' && entry.number == 2) {
        entry.specification = 'new value';
    }
});

console.log(cart);

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