首页 > 解决方案 > 如何将转换后的字符串转换回数组?

问题描述

据我所知,您只能将字符串保存到本地存储。所以,我必须编写一个函数来保存数组。如果我打电话console.log(fixA(["string1", [5, [false]], "string2"]));,我会得到"'string1',[5,[false]],'string2'". 这里是:

function fixA(array) {
  var toreturn = "";
  for (var i = 0; i < array.length; i++) {
    if (typeof array[i] === 'object') {
      toreturn += "[" + fixA(array[i]) + "]";
    } else {
      if (typeof array[i] === 'string') {
        toreturn += "'" + array[i] + "'";
      } else {
        toreturn += array[i];
      }
    }
    if (i < array.length - 1) {
      toreturn += ",";
    }
  }
  return toreturn;
}
console.log(fixA(["string1", [5, [false]], "string2"]));

现在的问题是我不知道如何将其转换回来。我尝试了一些事情,但总是卡在如何将数组转换回来。这基本上是我尝试过的:

function fixS(string) {
  var toreturn = [];  
  var temp = string.split(",");
  for (var i = 0; i < temp.length; i++) {
    // I could run a check here to see if temp[i] starts with "[", but I'm not sure how to tell where the array ends.
    // If it is an array, then I'd need to pass everything inside of the array back into fixS, making it recursive.
    // The times I tried to do those two things above, I ran into the issue that the commas inside of the sub arrays also split everything, which I don't want (as the recursive function will deal with that).
    toreturn.push(temp[i]);
  }
  return toreturn;
}
console.log(fixS("'string1',[5,[false]],'string2'"));
// This also doesn't return numbers as numbers or booleans as booleans.

那里不多,但据我所知。任何帮助表示赞赏。

标签: javascriptarraysstringp5.js

解决方案


除非您有无法用 JSON 表示的内容(您的示例可以),否则不要使用自己的定制解决方案,而是使用 JSON:

在页面加载时:

var data = JSON.parse(localStorage.getItem("data") || "null");
if (!data) {
    // There wasn't any, initialize
}

或者

var data = JSON.parse(localStorage.getItem("data") || "{}");

...如果您想要一个空白对象,如果本地存储中没有任何内容。

保存数据时:

localStorage.setItem("data", JSON.stringify(data));

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