我正在尝试使用javascript将数组设置为JSON对象中的键值。
当我设置数组值时
console.log(obj [“ likes”])显示大小为1的数组。
但在下一行console.log(obj)显示Likes键是大小为0的数组。
我有一个有关帖子信息的JSON对象。
如果帖子中没有喜欢的对象,则该字段在该帖子的对象中不存在。
我正在尝试实现一个不喜欢的更新功能,该功能用于检查用户是否喜欢帖子。
如果他还没有,那么我将他的用户名附加到喜欢的数组中,否则我将删除他的用户名。
userID是我在脚本标记开头定义的全局变量。
如果我设置一个新的字符串而不是userID,它将起作用:
obj["likes"] = ["XX"]
这也可以工作(我得到一个额外的空间,但至少可以正确记录日志):
obj["likes"] = [userId+" "]
console.log(obj["likes"])
console.log("Obj:",obj)
但是,然后再做一次是行不通的!!!!
let arr = [" "+userId]
console.log(arr)
arr[0] = arr[0].trim()
console.log(arr)
obj["likes"] = arr
console.log("Obj:",obj)
function saveLikeDislike(url, action) {
for (i = 0; i < crawledUrlsData.length; i += 1) {
if (typeof crawledUrlsData[i] === "object") {
var obj = crawledUrlsData[i]
if (url === obj["url"]) {
if (action === "like") {
if ("likes" in obj) {
likes = obj["likes"]
if (likes.includes(userId)) {
likes = likes.filter(id => id != userId)
} else {
likes.push(userId)
}
obj["likes"] = likes
} else {
var id = window.userId
console.log(userId)
obj["likes"] = [id]
console.log(obj["likes"])
console.log("Obj:",obj)
}
if ("dislikes" in obj) {
var dislikes = obj["dislikes"]
if (dislikes.includes(userId)) {
dislikes = dislikes.filter(id => id != userId)
obj["dislikes"] = dislikes
}
}
} else {
if ("dislikes" in obj) {
dislikes = obj["dislikes"]
if (dislikes.includes(userId)) {
dislikes = dislikes.filter(id => id != userId)
} else {
dislikes.push(userId)
}
obj["dislikes"] = dislikes
} else
obj["dislikes"] = [dislikes]
}
if ("likes" in obj) {
var likes = obj["likes"]
if (likes.includes(userId)) {
likes = likes.filter(id => id != userId)
obj["likes"] = likes
}
}
}
crawledUrlsData[i] = obj
console.log(obj["likes"])
renderData()
return
}
}
}
原来我错过了括号。
但这仍然不能解释在访问userId时设置一行键值和在下一行console.log输出不同的奇怪行为,但是如果以某种方式修改了userId则正确。
无论如何,这是固定功能:
function saveLikeDislike(url, action) {
for (i = 0; i < crawledUrlsData.length; i += 1) {
if (typeof crawledUrlsData[i] === "object" && crawledUrlsData[i]["url"] == url) {
var obj = crawledUrlsData[i]
if (url === obj["url"]) {
if (action === "like") {
if ("likes" in obj) {
console.log("likes in obj")
likes = obj["likes"]
if (likes.includes(userId)) {
likes = likes.filter(id => id != userId)
} else {
likes.push(userId)
}
obj["likes"] = likes
} else {
obj.likes = [userId]
console.log("Obj:",obj)
}
if ("dislikes" in obj) {
var dislikes = obj["dislikes"]
console.log("Dislikes: ",dislikes)
if (dislikes.includes(userId)) {
dislikes = dislikes.filter(id => id != userId)
obj["dislikes"] = dislikes
}
}
} else if (action === "dislike"){
if ("dislikes" in obj) {
dislikes = obj["dislikes"]
if (dislikes.includes(userId)) {
dislikes = dislikes.filter(id => id != userId)
} else {
dislikes.push(userId)
}
obj["dislikes"] = dislikes
} else {
obj["dislikes"] = [userId]
}
if ("likes" in obj) {
var likes = obj["likes"]
console.log("ID: ",userId)
if (likes.includes(userId)) {
likes = likes.filter(id => id != userId)
obj["likes"] = likes
}
}
}
}
crawledUrlsData[i] = obj
linkTreeRef.set(crawledUrlsData)
}
}
}
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