JavaScript version of in_array function (determining whether a specific value exists in an array)_javascript skills

We often use this same logic to determine whether a string or number is in an array. Many programming languages ​​have such specialized functions, such as PHP's in_array(). So does JS have such a function? Unfortunately, JS does not have such a function, so I thought about whether the great JQ encapsulated this function and found the API. JQ did encapsulate this function
jQuery.inArray( value, array ) Search Returns the specified value in an array and returns its index (or -1 if not found).
value The value to search for.
array is an array through which to search.

Of course, in the process of learning, I also wrote such a function myself:

Copy the code The code is as follows:

function inArray1(needle,array,bool){
if(typeof needle=="string"||typeof needle=="number"){
for(var i in array){
                                                                                                                          return true;                              false;
}
}



Three parameters, search for needle in array, bool is a Boolean quantity, if true, return the position of needle in array