在localStorage的不能推在数组对象 [英] Cannot push objects in array in localStorage
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问题描述
我想在存储阵列localStorage的价值,下面这个网页。推JSON对象在localStorage的阵列的。我的code是:
I am trying to store localStorage value in array and following this page Push JSON Objects to array in localStorage. My code is:
function SaveDataToLocalStorage(data)
{
var a = [];
// Parse the serialized data back into an aray of objects
a = JSON.parse(localStorage.getItem('session'));
// Push the new data (whether it be an object or anything else) onto the array
a.push(data);
// Alert the array value
alert(a); // Should be something like [Object array]
// Re-serialize the array back into a string and store it in localStorage
localStorage.setItem('session', JSON.stringify(a));
}
其中,数据
是:
var data = {name: "abc", place: "xyz"}
我收到以下错误:
I am getting the following error:
Uncaught TypeError: Cannot call method 'push' of null
任何人可以证明正确的方法来存储阵列localStorage的价值观?
Can anybody show the correct method to store localStorage values in array?
推荐答案
null是对于未初始化的对象的任何一个特殊的价值。
我的猜测是localStorage.getItem(会议)是空的。
null is a special value for objects that aren't initialized to anything. My guess is that localStorage.getItem('session') is empty.
一个更强大的答案会是这样
a more robust answer would be something like
function SaveDataToLocalStorage(data)
{
var a;
//is anything in localstorage?
if (localStorage.getItem('session') === null) {
a = [];
} else {
// Parse the serialized data back into an array of objects
a = JSON.parse(localStorage.getItem('session'));
}
// Push the new data (whether it be an object or anything else) onto the array
a.push(data);
// Alert the array value
alert(a); // Should be something like [Object array]
// Re-serialize the array back into a string and store it in localStorage
localStorage.setItem('session', JSON.stringify(a));
}
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