如何正确过滤键对象

Question

我有一些对象存储在localstorage中，我希望在获取键时忽略其中的一些对象，我有一个数组来过滤要忽略的键。 在这里将l视为具有实际键/值的bglist ，我想忽略bglist ， username和visitedbefore属性，我试图通过循环来做到这一点。 但是只有bglist被视为已过滤。

  var l = { '1': [{ description: 'ga', set_title: 'name this reminder' }], bglist: [ { author: 'Bildermeines', images: [ './images/bildermeines/landscape-2130844.jpg', './images/bildermeines/milky-way-2076251.jpg', './images/bildermeines/nature-2484584.jpg', './images/bildermeines/port-2506025.jpg', './images/bildermeines/waterfall-2115206.jpg', ], }, { author: 'Jez Timms', images: [ './images/jeztimms/jez-timms-157465.jpg', './images/jeztimms/jez-timms-158151.jpg', './images/jeztimms/jez-timms-178355.jpg', ], }, { author: 'Lubos Houska', images: [ './images/luboshouska/city-1134141.jpg', './images/luboshouska/prague-1168302.jpg', ], }, { author: 'oadtz', images: [ './images/oadtz/bangkok-1897718.jpg', './images/oadtz/electricity-1835546.jpg', './images/oadtz/star-1908593.jpg', ], }, { author: 'quangle', images: [ './images/quangle/ham-ninh-1050828.jpg', './images/quangle/sunrise-1014711.jpg', ], }, { author: 'skeeze', images: [ './images/skeeze/eiffel-tower-1156146.jpg', './images/skeeze/monument-valley-1593318.jpg', './images/skeeze/mountains-2228259.jpg', ], }, ], username: 'Disgusting', visitedbefore: false, }; let filterArr = ['bglist', 'username', 'visitedbefore']; let keys = Object.keys(l), i = 0, key, array, filterItem = 0; for (; filterItem < filterArr.length; filterItem++) { for (; (key = keys[i]); i++) { if (filterArr[filterItem] === key) { console.log(key + ' is filtered ' + filterArr[filterItem]); } else { console.log(key + ' is not filtered'); } } } 

以下给我一个输出

1 is not filtered
bglist is filtered bglist
username is not filtered
visitedbefore is not filtered

Answer 1

JSON.parse()检索器可用于轻松过滤键值对：

 var j = '{"1":[{"description":"ga","set_title":"name this reminder"}],"bglist":[{"author":"Bildermeines","images":["./images/bildermeines/landscape-2130844.jpg","./images/bildermeines/milky-way-2076251.jpg","./images/bildermeines/nature-2484584.jpg","./images/bildermeines/port-2506025.jpg","./images/bildermeines/waterfall-2115206.jpg"]},{"author":"Jez Timms","images":["./images/jeztimms/jez-timms-157465.jpg","./images/jeztimms/jez-timms-158151.jpg","./images/jeztimms/jez-timms-178355.jpg"]},{"author":"Lubos Houska","images":["./images/luboshouska/city-1134141.jpg","./images/luboshouska/prague-1168302.jpg"]},{"author":"oadtz","images":["./images/oadtz/bangkok-1897718.jpg","./images/oadtz/electricity-1835546.jpg","./images/oadtz/star-1908593.jpg"]},{"author":"quangle","images":["./images/quangle/ham-ninh-1050828.jpg","./images/quangle/sunrise-1014711.jpg"]},{"author":"skeeze","images":["./images/skeeze/eiffel-tower-1156146.jpg","./images/skeeze/monument-valley-1593318.jpg","./images/skeeze/mountains-2228259.jpg"]}],"username":"Disgusting","visitedbefore":false}' let filters = { 'bglist': 1, 'username': 1, 'visitedbefore': 1 } var result = JSON.parse(j, (k, v) => filters[k] ? void 0 : v) console.log(result)