Question

我已经搜索了网络和stackoverflow来回答这个问题。

如何从动态密钥中检索值，该动态密钥也嵌套在localstorage中。我尝试了很多例子，似乎无处可去。我需要一个循环来执行任务，但是哪种类型。

我如何获得＆＃39; uniqid＆＃39;具有来自localstorage的嵌套动态密钥SCI-4的值，其中包含：

simpleCart_items:{"SCI-4":{"quantity":4,"id":"SCI-4","price":8,"name":"12 fried chicken","flavours":"cola","code":"1001","cartid":"561","uniqid":"592dcd08b5fcc"}}

这允许我查看localstorage。

var obj = localStorage;                   
Object.keys(obj).forEach(function(key){
    var value = obj[key];
    console.log(key + ':' + value);
});

如何迭代获取任何值？

这个问题的不同之处在于我试图从具有动态值的嵌套键中获取值。如果不知道密钥怎么拉值？循环应该是什么样的？

Answer 1

认为这是您正在寻找的，:)）

Object.keys(obj).forEach(function (key) {
Object.keys(obj[key]).forEach(function (val) {
  //console.log(val);
  if(val === "uniqid")
  {
   //logic here
   console.log(obj[key][val]);
  }
});

}）;

Answer 2

如果您只是将结构存储为单个键的单个值，则以后很容易将其提取出来。

＆＃13;

// How do I get the 'uniqid' value which has the nested dynamic key SCI-4 from localstorage which reads:

// This is our simulated result from pulling from localStorage
var lsString = `{ 
                  "simpleCart_items": { 
                      "SCI-4": {
                        "quantity":4,
                        "id":"SCI-4",
                        "price":8,
                        "name":"12 fried chicken",
                        "flavours":"cola",
                        "code":"1001",
                        "cartid":"561",
                        "uniqid":"592dcd08b5fcc"
                       }
                   }
}`;


// First, remember that localStorage stores strings, so we must parse the string 
// back into an object:
var lsObj = JSON.parse(lsString);

var keyName = Object.keys(lsObj.simpleCart_items).toString();

// Now, we can go directly to the property we want:
console.log(lsObj.simpleCart_items[keyName].uniqid);

＆＃13;

Answer 3

经过一夜好眠后。我能够取得进展。谢谢你指点我正确的方向。有许多意见和方法可以解决这些功能中令人困惑的问题。

localStorage需要正确访问，如下所示。问题主要通过以下方式解决：

var obj = JSON.parse(localStorage.simpleCart_items);

                        Object.keys(obj).forEach(function (key) {
                            Object.keys(obj[key]).forEach(function (val) {
                                //console.log(val);
                                if (val === "quantity")
                                {
                                    //logic here
                                    console.log(obj[key][val]);
                                }
                            });
                        });

从动态密钥

3 个答案: