清除特定密钥的localstorage

Question

我已经在localstorage中存储了一些信息，数据存储如下：

#firstWordCategory#

现在我想在8中为特定的id设置MsgCount = 0：user_abc-com

那怎么做？

Answer 1

s是您的localStorage，jsfiddle

var s = "[{\"id\":\"user_abc-com\",\"MsgCount\":8},{\"id\":\"user2_abc-com\",\"MsgCount\":16}]";
var s_obj = JSON.parse(s); // parsing it from string to object

s_obj.forEach(function(v, k) { // iterate through array
    if(v.id == 'user_abc-com') s_obj[k].MsgCount = 0 // change value
});

s = JSON.stringify(s_obj); // switching to string again (ready to save in localStorage)

Answer 2

只需使用新值更新元素：

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var messages = [
  {"id": "user_abc-com", "MsgCount": 8},
  {"id": "user2_abc-com", "MsgCount": 16}
];

localStorage.setItem('MessageCount', JSON.stringify(messages));

// ----------- //

var messages = JSON.parse(localStorage.getItem('MessageCount'));
messages[0]['MsgCount'] = 0;
localStorage.setItem('MessageCount', JSON.stringify(messages));

// ----------- //

console.log(localStorage.getItem('MessageCount'));

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