Analyzing the designated parameter $ .isArray () is a function of whether the array. Returns a Boolean value.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
</head>
<body>
<div class="box"></div>
<div class="box"></div>
<script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.js"></script>
<script>
console.log($('.box'));
var res = $.isArray($('.box'));
console.log(res);
</script>
</body>
</html>
Another example -
arr = [1,2,3,4]; res = $.isArray(arr); console.log(res);
Return: true
$ .InArray () to find the specified value in the array, and returns the index of the first occurrence (not found, returns -1) source array is not affected
It takes three arguments, the first is what you're looking, and the second is to find the target array, a third of the value specified search start position (including the position of the current value)
For chestnut (¯, ¯)
arr = ['hello',5,5,'hello',8]; res1 = $.inArray('hello',arr); console.log(res1); res2 = $.inArray('hello',arr,2); console.log(res2);
res1：0
res2: 3