Array.findIndex方法将返回与子字符串匹配的数组元素的索引。 constarray = ['hello','world'];constsubstring ='hell';constindex = array.findIndex(element=>{if(element.includes(substring)) {returntrue; } });console.log(index);// 👉️ 0if(index !==-1) {// array contains substring match...
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....
对于这些类型的东西，使用polyfill是完全可以接受的：
const array = [1, 2, 3, 4, 5]; const value = 3; if (array.includes(value)) { console.log("数组包含该值"); } else { console.log("数组不包含该值"); } 在上面的示例中,我们定义了一个名为array的数组,其中包含了一些整数。然后,我们定义了一个名为value的变量,它存储了我们要检查的特定...
Array 对象的方法 FF: Firefox, N: Netscape, IE: Internet Explorer Array 对象的属性 FF: Firefox, N: Netscape, IE: Internet Explorer new Array() new Array(len) new Array([item0,[item1,[item2,...]]] 使用数组对象的方法: var objArray=new Array(); ...
* @param string value * @return bol */ function contains(input, value) { if (!is_array(input)) { if (input.indexOf(value) != -1) { return true; } } else { var i = input.length; while (i–) { if (input[i] === value) { ...
true if the element is found in the array return true; } } // Return false if the element is not found in the array return false; } // Sample array arr = [2, 5, 9, 6]; // Output the result of checking if the array contains the element '5' console.log(contains(arr, 5));...
Array.prototype.contains = function (element) { for (var i = 0; i < this.length; i++) { if (this[i] == element) { return true; } } return false;} 这样就可以直接调用此方法来判断。 var arr = new Array(); if(arr.constains("ddd")){ arr[i] = "dfsdfsd"; } http://bbs....
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 ...
@example ['Hello, world!'].contains('world!') * true * * @return {Bool} Returns bool true/false. */Array.prototype.contains =Array.prototype.contains ||function(value) {for(vari = 0, len = this.length; i < len; i++) {if(this[i] === value) {returntrue; } }returnfalse; }...