How to use inarray

inArray() is a function for arrays, mainly used to determine whether an element exists in the array. It receives two parameters: the element to find and the array. Returns the index of the element in the array if it exists; -1 if it does not exist. The syntax of the inArray() function: inArray(searchElement, array).

inArray() is a function for arrays, mainly used to determine whether an element exists in the array. It receives two parameters: the element to find and the array. Returns the index of the element in the array if it exists; -1 if it does not exist.

The syntax of the inArray() function is as follows:

inArray(searchElement,  array)

Parameter description:

searchElement: The element to be found.

array: Array to search.

Example:

//  假设有一个数组   
var  arr  =  ['apple',  'banana',  'cherry',  'orange'];
//  判断元素  'banana'  是否存在于数组中   
var  index  =  arr.inArray('banana');
//  输出结果：2   
console.log(index);   //  输出  2，因为  'banana'  在数组中的索引是  2
//  判断元素  'pear'  是否存在于数组中   
var  index  =  arr.inArray('pear');
//  输出结果：-1   
console.log(index);   //  输出  -1，因为  'pear'  不在数组中

It should be noted that the inArray() function is case-sensitive when determining whether an element exists.

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