Extending JavaScript Arrays /** * Array.prototype.[method name] allows you to define/overwrite an objects method * needle is the item you are searching for * this is a special variable that refers to "this" instance of an Array. * returns true if needle is in the array, and false othe...
var regs = new Array(); regs.push(new Array("item_1","^[\\s\\S]+$","item_1Span","法人代表不能为空","填写正确",true)); regs.push(new Array("item_2","^[\\s\\S]+$","item_2Span","开户银行不能为空","填写正确",true)); regs.push(new Array("item_3","^[\\s\\S]...
确定指定对象是否是Array对象中的元素。此函数是静态的,可在不创建对象实例的情况下调用。 var itemExists = Array.contains(array, item); 返回值 如果指定对象是数组中的元素,则为true;否则为false。 备注 使用contains函数确定指定对象是否是Array对象中的元素。 在Mozilla Firefox 中,如果数组中的项已设置为undef...
下面是使用for循环遍历数组的示例代码: functionisElementInArray(arr,element){for(leti=0;i<arr.length;i++){if(arr[i]===element){returntrue;}}returnfalse;}// 示例用法constarr=[1,2,3,4,5];constelement=3;console.log(isElementInArray(arr,element));// 输出: true 1. 2. 3. 4. 5. 6...
在kotlin语言中的数组有一个contains函数非常方便,然后就想在js中实现 // kotlinvalkeyword=arrayOf("function","var","return")if(keyword.contains("var")){//...} //JavaScriptArray.prototype.contains=function(element){for(variinthis){if(this[i]===element){returntrue;}}returnfalse;}varkeyword=[...
feat: update includeSelector in ArticlesAutoTranslate workflow (#406) … Verified 9758182 Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment Assignees No one assigned Labels ukrainian Projects [NEWS I18N] - Ukrainian Status: Todo +3 more ...
https://www.freecodecamp.org/news/check-if-an-item-is-in-an-array-in-javascript-js-contains-with-array-includes/ RafaelDavisH added the spanish label Apr 12, 2024 RafaelDavisH assigned LucasAMoralesRomero Apr 12, 2024 Collaborator LucasAMoralesRomero commented Apr 12, 2024 • edited ...
*/constlog =console.log;Array.prototype.contains=function(key) {// log(`\nthis`, this, this.length);// for (let item in this) {for(letitemofthis) {// log(`item =,`, item);// log(`key =`, key);// if (item == key) {// if (item === key) {// type checker Object...
javascript的Array没有contains方法,有时候这会不方便,contains方法实现很简单: 代码如下: function contains(a, obj) { var i = a.length; while (i–) { if (a[i] === obj) { return true; } } return false; } 当然我们也可以扩展Array类,如下js 代码如下: Array.prototype.contains = function(ob...
---在JavaScript中,有几种常用的方法可以用来遍历对象:for...in循环使用for...in循环可以遍历一个对象中的所有可枚举属性。它会将属性名逐个赋值给循环变量,并执行循环体内的代码。...for (let key in obj) { if (obj.hasOwnProperty(key)) { console.log(key, obj[key]); }}在遍历过程中,属性名会被...