尋找是否有符合的元素. 方法一： indexOf. 使用原生JavaScript 的 Array.prototype.indexOf() 。 如下例，陣列fruit 中 ... ... <看更多>

To find the position of an element in an array, you use the indexOf() method. This method returns the index of the first occurrence the element that you want to ... ... <看更多>

If you have worked with JavaScript at any length you are aware that IE does not implement. the ECMAScript function for Array.prototype.indexOf() [including ... ... <看更多>

inArray is a terrible name for a function that returns the index of the element, and -1 if it doesn't exist. I would expect a boolean to be returned. – Tim. Jul ... ... <看更多>

Aug 4, 2020 - In this tutorial, you will learn JavaScript array indexOf() and lastIndexOf() methods. These javascript array methods help us to find the ... ... <看更多>

Let us learn about find, includes, etc. methods available for arrays which allows us to iterate over arrays in ... ... <看更多>