regs.push(new Array("item_2","^[\\s\\S]+$","item_2Span","开户银行不能为空","填写正确",true)); regs.push(new Array("item_3","^[\\s\\S]+$","item_3Span","帐号不能为空","填写正确",true)); //regs.push(new Array("PlantArea","^[\\s\\S]+$","PlantAreaSpan","厂...
console.log("str1.contains(str2)="+str1.contains(str2)); //数组扩展contains适用于数组判断 Array.prototype.contains = function(a) { if ("string" == typeof a || "number" == typeof a) for (var b in this) if (a == this[b]) return ! 0; return ! 1 }; var arr1=["jb51....
After adding the string "apple" to the array, the array contains two elements, and has a length of 2. This gets returned from the addToList function. The push method modifies the original array. If you wanted to return the array from the function rather than the length of the array, ...
* 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 otherwise */Array.prototype.contains=...
Note: Suppose you want to remove the second, third, and fourth elements. You can use the following code to do so: numbers.splice(1, 3); To learn more, visit JavaScript Array splice(). Array Methods JavaScript has various array methods to perform useful operations. Some commonly used array...
includes()Check if an array contains the specified element indexOf()Search the array for an element and returns its position isArray()Checks whether an object is an array join()Joins all elements of an array into a string keys()Returns a Array Iteration Object, containing the keys of the ...
Javascript Array contains(value) /**//www.java2s.com* Bool check if an Array contains a value * * * @example ['Hello, world!'].contains('world!') * true * * @return {Bool} Returns bool true/false. */Array.prototype.contains =Array.prototype.contains ||function(value) {for(vari ...
在JavaScript 中,Array 是一种用来存储一组有序元素的数据结构。我们可以使用Array.includes()方法来检查一个数组是否包含某个元素。该方法会返回一个布尔值,表示数组中是否包含该元素。但如果你的 JavaScript 环境不支持Array.includes(),也可以使用Array.indexOf()方法来实现相同的效果。
Finding a value in an array is useful for effective data analysis. Learn how to discover what a JavaScript Array contains using indexOf, includes, for loop, some methods and more.
The JavaScript method toString() converts an array to a string of (comma separated) array values.Example const fruits = ["Banana", "Orange", "Apple", "Mango"]; document.getElementById("demo").innerHTML = fruits.toString(); Result: Banana,Orange,Apple,Mango Try it Yourself » ...