functioncontains(arr, val){returnarr.filter((item)=>{returnitem == val }).length >0;} 方式三:array.indexOf array.indexOf此方法判断数组中是否存在某个值,如果存在返回数组元素的下标,否则返回-1。 [1, 2, 3].indexOf(1);//0["foo","fl...
除了find,我们也可以使用array.indIndex。返回数组中满足条件的第一个元素的索引(下标), 如果没有找到,返回-1 同第3种方法类似。 方式六、利用set中has方法 function contains(arr, val) { return new Set(arr).has(val) } contains([1,2,3],2);//true 1. 2. 3. 4. 通过new set([])将数组转换...
Underscore.js:_.contains(array, value)(也称为_.include和_.includes) Dojo Toolkit:dojo.indexOf(array, value, [fromIndex, findLast]) Prototype:array.indexOf(value) MooTools:array.indexOf(value) MochiKit:findValue(array, value) MS Ajax:array.indexOf(value) Ext:Ext.Array.contains(array, value...
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]...
Array.prototype.indexOf = function (e) { for (var i = 0, j; j = this[i]; i++) { if (j.indexOf(e) != -1) { return i; } } return -1; } if (anSwerIdValue.length < 14) { alert("请你答满13题目"); return false; } else if (questionId.length == 13 && anSwerIdVal...
Find Element in Array Write a JavaScript function to find an array containing a specific element. Test data: arr = [2, 5, 9, 6]; console.log(contains(arr, 5)); [True] Visual Presentation: Sample Solution: JavaScript Code: // Function to check if an array contains a specific elementfu...
put-array-or-string-here.indexOf() Code //code to check if a value exists in an array using javascript indexOf var fruits_arr = ['Apple', 'Mango', 'Grapes', 'Orange', 'Fig', 'Cherry']; var string = "Orange"; // Find in Array fruits_arr.indexOf('Tomato'); fruits_arr.index...
contains(String.valueOf(temp))) { x.add(j); y.add(k); break toHere; } } } } boolean flag = false; for (int i = 0; i < x.size() - 2; i++) { // 如果X一致,那么就是在一排 if (x.get(i) == x.get(i + 1) && x.get(i + 1) == x.get(i + 2)) {//四者...
if(source !== undefined && source !== null) { // 将源象转换成对象 // 需要将源自身的可枚举数据进行复制 // Reflect.ownKeys(obj) const keysArray = Reflect.ownKeys(Object(source)); for (let nextIndex = 0; nextIndex < keysArray.length; nextIndex++) { const nextKey = keysArray[nextIndex...
Theincludes()method returnstrueif an array contains a specified value. Theincludes()method returnsfalseif the value is not found. Theincludes()method is case sensitive. Syntax array.includes(element,start) Parameters ParameterDescription elementRequired. ...