使用size 代码语言:javascript 复制 varmySet=newSet();mySet.add(1);mySet.add(5);mySet.add('some text')mySet.size;// 3 规范 Specification Status Comment ECMAScript 2015 (6th Edition, ECMA-262)The definition of 'Set.prototype.size' in that specification. ...
1. Set只有一项属性即size. 复制 > exampleSet = newSet([1, 5, 8])Set(3) { 1, 5, 8 }> exampleSet.size3 1. 2. 3. 4. 二、Set的内建操作方法 Set内建的操作方法包括:1)插入insertion 2) 删除 deletion 3) contain包含三项 复制 // insertion> sampleSet.add(17)Set(1) { 17 }> samp...
let mySet = new Set(); mySet.add(1); // Set { 1 } mySet.add(2); // Set { 1, 2 } mySet.add(1); // 仍然是 Set { 1, 2 },因为1已经存在 console.log(mySet.has(1)); // 输出: true console.log(mySet.size); // 输出: 2 ...
JavaScript——Set 的用法 1.set对象的声明 let set1 =newSet() 2.获取元素数量 set1.size 3.检测元素是否存在 set1.has(' ') 4.删除元素 set1.delete(' ') 4.清除元素 set1.clear() 5.将set对象转化为数组 //方法一 const set =newSet([1,2,3,4,4,]); [...set]; //方法二 Array.fro...
javascript 清除 js清除setinterval 我们有时会有清除页面中所有定时器的需求 如果我们在创建定时器(setInterval)的时候用一个变量保存了它,那么清除这个定时器很简单,直接清除(clearIntetval)就好了 例如: let timer = setInterval(function () { console.log('timer');...
本文基于Vue 3.2.30版本源码进行分析为了增加可读性,会对源码进行删减、调整顺序、改变部分分支条件的操作,文中所有源码均可视作为伪代码由于ts版本代码携...
C++ STL set::size() function: Here, we are going to learn about the size() function of set in C++ STL (Standard Template Library). Submitted by Radib Kar, on February 16, 2019 C++ STL set::size() functionset::size() function is a predefined function, it is used to get the size...
This post will discuss how to convert an array to set in JavaScript... The recommended solution is to pass the array to the set constructor, which accepts an iterable object.
❮PreviousJavaScript DateReferenceNext❯ Example 1 constd =newDate("2025-01-15"); d.setHours(15); Try it Yourself » Description setHours()sets the hour of a date. setHours()can also set minutes, seconds and milliseconds. Example 2 ...
httpOnly- indicates cookie shouldnotbe accessible to client-side JavaScript (true or undefined) sameSite- indicates if cookie should be included in cross-site requests (more info) (string or undefined) Note: valid values are"Strict","Lax", and"None", but set-cookie-parser coppies the value ...