Javascript 将对象数组设置为 sessionStorage
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Setting an array of objects to sessionStorage
提问by Teslo.
Ok, so I have this JSON:
好的，所以我有这个 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"}
]}
My code is:
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 :(
}
}
But... this is not working properly! After the assignment, the sessionStorage seen from Firebug looks like this:
但是……这不能正常工作！赋值后，从 Firebug 看到的 sessionStorage 是这样的：
sessionStorage:
会话存储：
- ListaPermessi = "[object Object],[object Object],[object Object],[object Object],[object Object]"
- ListaPermessi = " [对象对象],[对象对象],[对象对象],[对象对象],[对象对象]"
What is the proper way to assign an array of objects to a sessionStoragevariable from javascript?
将对象数组从 javascript分配给sessionStorage变量的正确方法是什么？
回答by James Allardice
You need to turn it back into a JSON string. You can do that with the JSON.stringifymethod:
您需要将其转换回 JSON 字符串。您可以使用以下JSON.stringify方法做到这一点：
sessionStorage.setItem("ListaPermessi", JSON.stringify(parsedResult.ListaPermessi));
The reason for this is that web storage can only store strings, and the default toStringmethod of Objectreturns, as you've now seen, "[object Object]".
这样做的原因是 Web 存储只能存储字符串，并且返回的默认toString方法Object，正如您现在看到的，“[object Object]”。
Side note: typeofis an operator, not a function, so there's no need for the parentheses:
旁注：typeof是一个运算符，而不是一个函数，所以不需要括号：
if (typeof Storage !== "undefined") { //...
