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Are you wondering how to get the last element of an array in JavaScript? JavaScript has a lot of built-in methods that can be used to manipulate arrays. Let’s find out what we can implement to access the last element of the array.
例如:arr.lastIndexOf(7) --- 从后往前找第一个7,索引值为6,所以结果就是6。 2.两个参数时,arr.lastIndexOf(4,6) --- 在索引0---6之间找4,其索引值为4,所以结果就是4。 arr.lastIndexOf(4,3) --- 在索引0---3之间找4,其中没有4,所以返回-1 语法:array.IndexOf(item,start) 参数: 返...
如果找到一个 item,则返回 item 从尾向前检索第一个次出现在数组的位置。数组的索引开始位置是从 0 开始的。如果在数组中没找到指定元素则返回 -1。提示: 如果你想查找数组首次出现的位置,请使用 indexOf() 方法。浏览器支持所有主要浏览器都支持lastIndexOf()属性,但是在Internet Explorer 8 及更早IE版本不...
get last item in an arraylist get last item in an list in vb.net Get latest added id using Dapper - Insert query Get List by IDs Get method name that generated the exception? Get MimeType of Bitmap object Get Multiple item counts from a single LINQ Query Get next index value in list...
lastIndexOf() 方法返回数组中给定元素最后一次出现的索引,如果不存在则返回 -1。该方法从 fromIndex 开始向前搜索数组。
// Fastest method, requires the array is in a variablemyArray[myArray.length-1];// Also very fast but it will remove the element from the array also, this may or may not matter in your case.myArray.pop();// Slowest but very readable and doesn't require a variablemyArray.slice(-1...
The findLastIndex() method executes a function for each array element.The findLastIndex() method returns the index (position) of the last element that passes a test.The findLastIndex() method returns -1 if no match is found. The findLastIndex() method does not execute the function for...
Default is the last element (array.length-1). Negative start values counts from the last element (but still searches from right to left). Return Value TypeDescription A numberThe position of the specified item. -1 if the item is not found. ...
The lastIndexOf() method in JavaScript is used to search a string or array for a specified value and return the position of the last occurrence of that value. This method is similar to the indexOf() method, but instead of returning the first occurrence of the value, it returns the last...