如何删除以特定字符串开头的localStorage数据? [英] How to remove localStorage data starting with a certain string?

问题描述

我想删除与Firebase相关的localStorage.我试过了:

I want to remove Firebase-related localStorage. I tried this:

  let arr = [] // Array to hold the keys
  // Iterate over localStorage and insert the keys that meet the condition into arr
  for (let i = 0; i < localStorage.length; i++) { // eslint-disable-line
    console.log(localStorage.key(i)) // eslint-disable-line
    if (localStorage.key(i).substring(0,3) == 'firebase:') { // eslint-disable-line
      arr.push(localStorage.key(i)) // eslint-disable-line
    }
  }
  // Iterate over arr and remove the items by key
  for (let i = 0; i < arr.length; i++) {
    localStorage.removeItem(arr[i]) // eslint-disable-line
  }

但是它们根本没有被删除.

However they are not being removed at all.

我在做什么错了?

推荐答案

substring(0,3) == 'firebase:'

这不可能是真的.您将得到一个3个字符长的字符串，并将其与"firebase:"进行比较.只需将3更改为9，就可以这样:

This can never be true. You're getting a string 3 characters long and comparing it to "firebase:". Just change your 3 to a 9 so it looks like this:

substring(0, 9) == 'firebase:'

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