如何在数组中创建JSON数组

Question

这是第一篇文章

我正在尝试复制这种JSON对象,以便我可以使用stringify将其存储在localStorage中:

我希望能够在事件被捕获时在历史记录内创建一个新的noteState但不知道如何去做这件事.

var history = {
    "noteState1": [
        {created: new Date(),
        modified: new Date(),
        left: "100",
        top: "200",
        text: "hello"},

        {created: new Date(),
        modified: new Date(),
        left: "150",
        top: "250",
        text: "new"},

        {created: new Date(),
        modified: new Date(),
        left: "200",
        top: "300",
        text: "world"}
    ], 
    "noteState2": [
        {created: new Date(),
        modified: new Date(),
        left: "100",
        top: "200",
        text: "hello"},

        {created: new Date(),
        modified: new Date(),
        left: "150",
        top: "250",
        text: "new"},

        {created: new Date(),
        modified: new Date(),
        left: "200",
        top: "300",
        text: "world"}
    ]
}

如何在历史记录中创建一个包含单个数组的新成员？

Answer 1

你不修改json字符串 - 这太冒险了.而是将它转换回本机javascript数组/对象,在其上使用常规数组push/pop类型运算符,然后转换回json字符串.