});console.log(match);// 👉️ helloif(match !==undefined) {// array contains substring match} 我们传递给Array.find方法的函数将对数组的每个元素进行调用,直到它返回真值或耗尽数组的元素。 如果函数从不返回真值,则Array.find返回未定义。 我们使用String.includes()方法检查每个数组元素中是否包含子字...
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....
console.log(check3); // false let check4 = sentence.includes(""); console.log(check4); // true Run Code Output true false false false true Also Read: JavaScript String indexOf() JavaScript Array includes() JavaScript Program to Check Whether a String Contains a Substring Share...
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 ...
The includes() is a built-in method of JavaScript that is used to discover whether an element is present in an array or not. It can also be used to find substrings in a string. The returning value of the includes() method is a boolean, which means it eit
JavaScript Array Contains Javascript objects are really nice, but sometimes they are missing some useful little functions/methods. The example above is with Arrays. It’s really nice to know whether or not an item is contained within your array. Well you can write a function that takes the ...
使用javascript实现C#的String.contains() 1functionisContains(str, substr) {2returnstr.indexOf(substr) >= 0;3} str为源字符串; substr为查找的字符; 返回true代表包含,false代表不包含。
includes()Returns if a string contains a specified value indexOf()Returns the index (position) of the first occurrence of a value in a string lastIndexOf()Returns the index (position) of the last occurrence of a value in a string
Array.prototype.containsObject =function(obj){vari;/*fromwww.java2s.com*/for(i = 0; i < this.length; i++) {if(this[i] === obj) {returntrue; } }returnfalse; }; Javascript Array containsObject(obj) Array.prototype.containsObject =function(obj) {varcontains = false;for(vari = 0; i...
console.log(lengthArray); // [5] // 创建并初始化一个多维数组 var matrix = new Array([1, 2, 3], [4, 5, 6], [7, 8, 9]); 2.数组的基本操作 2.1:获取数组的长度: var fruits = ['apple', 'banana', 'orange']; console.log(fruits.length); // 输出:3 ...