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>

call to apply the Array indexOf() function on the NodeList. const inputs = document.getElementsByTagName('input'); function getIndex ... ... <看更多>

the ECMAScript function for Array.prototype.indexOf() [including IE8]. Not a huge problem. because you can extend the functionality on your page with the ... ... <看更多>

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