将对象数组设置为sessionStorage [英] Setting an array of objects to sessionStorage

问题描述

好，所以我有这个JSON:

Ok, so I have this JSON:

{"Status":"OK!","ListaPermessi":
[{"IdPermesso":10,"Nome":"WIND_PARAMS"},
 {"IdPermesso":11,"Nome":"ADMIN_SERVER"},
 {"IdPermesso":21,"Nome":"REC"},
 {"IdPermesso":22,"Nome":"REC_DIST"},
 {"IdPermesso":23,"Nome":"REC_DIST_CR"}
]}

我的代码是:

var parsedResult = JSON.parse(result); // where result is the above JSON
if (parsedResult.Status === "OK!") {
    // Set sessionStorage vars
    if (typeof(Storage) !== "undefined") {
        // localStorage & sessionStorage support!

        sessionStorage.setItem("ListaPermessi", parsedResult.ListaPermessi);
    }
    else {
        // Sorry! No web storage support :(
    }
}

但是...这不能正常工作！分配后，从Firebug中看到的sessionStorage看起来像这样:

But... this is not working properly! After the assignment, the sessionStorage seen from Firebug looks like this:

sessionStorage :

• ListaPermessi =" [对象对象]，[对象对象]，[对象对象]，[对象对象]，[对象对象] "

通过JavaScript将对象数组分配给 sessionStorage 变量的正确方法是什么?

What is the proper way to assign an array of objects to a sessionStorage variable from javascript?

推荐答案

您需要将其转换回JSON字符串.您可以使用 JSON.stringify 方法:

You need to turn it back into a JSON string. You can do that with the JSON.stringify method:

sessionStorage.setItem("ListaPermessi", JSON.stringify(parsedResult.ListaPermessi));

这样做的原因是Web存储只能存储字符串，并且默认的toString方法Object返回，如您现在所见，为"[object Object]".

The reason for this is that web storage can only store strings, and the default toString method of Object returns, as you've now seen, "[object Object]".

旁注: typeof 是运算符，而不是函数，因此不需要括号:

Side note: typeof is an operator, not a function, so there's no need for the parentheses:

if (typeof Storage !== "undefined") { //...

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