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>

The indexOf() returns the index of the first occurrence of a substring in a string, or -1 if the string does not contain the substring. · The indexOf() is case- ... ... <看更多>

indexOf (searchElement[, fromIndex]) · javascript arrays indexof. const beasts = ['ant', 'bison', ... ... <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>

In this tutorial we're going to learn about the #indexOf and #lastIndexOf #JavaScript Array Methods and how ... ... <看更多>