*/ toString(): string; /** * Returns a string representation of an array. The elements are converted to string using their toLocaleString methods. */ toLocaleString(): string; /** * Removes the last element from an array and returns it. * If the array is empty, undefined is returned ...
let set=newSet(nums);returnArray.from(set) // return Array.from(new Set(nums)); } console.log(removeDuplicate(nums)); 2.利用Array indexOf, lastIndexOf ,includes,some arr.indexOf(searchElement[, fromIndex]) 首个被找到的元素在数组中的索引位置; 若没有找到则返回 -1 arr.lastIndexOf(searc...
1. 2. 3. 4. 5. 6. 7. 2.js sort方法根据数组中对象的某一个属性值进行升序或者降序排列 /**数组根据数组对象中的某个属性值进行排序的方法 * 使用例子:newArray.sort(sortBy('number'),false) //表示根据number属性降序排列;若第二个参数不传递,默认表示升序排序 * @param attr 排序的属性 如numbe...
AI代码解释 letcloneEl=nullletoriginalEl=nulldocument.getElementById('list').addEventListener('click',function(e){e.preventDefault()if(e.target.classList.contains('item')){originalEl=e.target// 缓存原始图DOM节点cloneEl=originalEl.cloneNode(true)// 克隆图片originalEl.style.opacity=0openPreview()/...
remove(element) { const index = this .findindex(element); return this .removeat(index); } isempty() { return ! this .length; } size() { return this .length; } // 转为字符串 tostring() { let current = this .head; let string = ""...
Remove the last element from the array. Show the contents of the array. Iterating through an array - Demo Iterating through the elements of an array, one at a time, is a very common practice in programming. We can use aforloop to iterate over the elements of an array like this: ...
lastIndexOf 是JavaScript 中的一个数组方法,用于查找指定元素在数组中最后一次出现的索引位置。如果数组中不存在该元素,则返回 -1。 基础概念 lastIndexOf 方法的基本语法如下: 代码语言:txt 复制 array.lastIndexOf(searchElement[, fromIndex]) searchElement:需要查找的元素。 fromIndex(可选):开始查找的位置。如...
getElementById("jspaint-iframe"); // contentDocument here refers to the webpage loaded in the iframe, not the image document loaded in jspaint. // We're just reaching inside the iframe to get the canvas. var canvas = iframe.contentDocument.querySelector(".main-canvas");...
r.rawHeadersIn{} 请求头KV Array,只读。请求头Host: localhost Foo: bar foo: bar2输出类似于['Host', 'localhost'], ['Foo', 'bar'], ['foo', 'bar2'] 获取所有的请求头foo可使用r.rawHeadersIn.filter(v=>v[0].toLowerCase() == 'foo').map(v=>v[1]),输出['bar', 'bar2']。
lastIndexOf Gets the index of the last occurrence of the specified value in a list. map Calls the specified callback function on each element of a list, and returns an array that contains the results. move Moves the value at index to the specified position. ...