javascript 删除数组中重复值的几种方法介绍
具体方法请看下面代码,每种方法都附带了解释,大家可以自己在本网站的在线代码调试工具中运行一下每种方法。
<code class="javascript">/*方法一: 1,'1' 会被认为是相同的; 所有hash对象,如:{x;1},{y:1}会被认为是相同的 //10ms */ Array.prototype.unique=function(){ var newArr=[],obj={}; for(var i=0,len=this.length;i<len if newarr.push obj return newarr array.prototype.unique="function(){" var for i="0,len=this.length;i<len;i++){" j="i+1,len=newArr.length;j<len;j++)" newarr.splice j-- len arr0='[11,21,221,13,24,"134","1",{x:1,y:1},{name:"pobaby",age:"12",hobby:"football"},{name:"pobaby1",age:"121",hobby:"football1"}];' arr="[],num;" num="Math.floor(Math.random()*50);" arr.push t1="new" date console.log arr.unique t2="new"></len></code>

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1. First of all, it is false to block and delete someone permanently and not add them permanently. If you want to add the other party after you have blocked them and deleted them, you only need the other party's consent. 2. If a user blocks someone, the other party will not be able to send messages to the user, view the user's circle of friends, or make calls with the user. 3. Blocking does not mean deleting the other party from the user's WeChat contact list. 4. If the user deletes the other party from the user's WeChat contact list after blocking them, there is no way to recover after deletion. 5. If the user wants to add the other party as a friend again, the other party needs to agree and add the user again.

1. Open the Douyin app, click [Message] at the bottom of the interface, and click the chat conversation entry that needs to be deleted. 2. Long press any chat record, click [Multiple Select], and check the chat records you want to delete. 3. Click the [Delete] button in the lower right corner and select [Confirm deletion] in the pop-up window to permanently delete these records.

Face detection and recognition technology is already a relatively mature and widely used technology. Currently, the most widely used Internet application language is JS. Implementing face detection and recognition on the Web front-end has advantages and disadvantages compared to back-end face recognition. Advantages include reducing network interaction and real-time recognition, which greatly shortens user waiting time and improves user experience; disadvantages include: being limited by model size, the accuracy is also limited. How to use js to implement face detection on the web? In order to implement face recognition on the Web, you need to be familiar with related programming languages and technologies, such as JavaScript, HTML, CSS, WebRTC, etc. At the same time, you also need to master relevant computer vision and artificial intelligence technologies. It is worth noting that due to the design of the Web side

The method of using a foreach loop to remove duplicate elements from a PHP array is as follows: traverse the array, and if the element already exists and the current position is not the first occurrence, delete it. For example, if there are duplicate records in the database query results, you can use this method to remove them and obtain results without duplicate records.

The performance comparison of PHP array key value flipping methods shows that the array_flip() function performs better than the for loop in large arrays (more than 1 million elements) and takes less time. The for loop method of manually flipping key values takes a relatively long time.

Methods for deep copying arrays in PHP include: JSON encoding and decoding using json_decode and json_encode. Use array_map and clone to make deep copies of keys and values. Use serialize and unserialize for serialization and deserialization.

1. Open the WeChat app, click [Me] in the lower right corner, find and click the [Moments] option. 2. Click [My Moments] in the upper right corner and find the content in the Moments you want to delete on the My Moments interface. 3. Click to enter the details page of this circle of friends, and click the [small trash can] icon to the right of the content release time. 4. Select [OK] in the pop-up window, thus completing the operation of deleting the content in the circle of friends.

Multidimensional array sorting can be divided into single column sorting and nested sorting. Single column sorting can use the array_multisort() function to sort by columns; nested sorting requires a recursive function to traverse the array and sort it. Practical cases include sorting by product name and compound sorting by sales volume and price.
