Compare two arrays in Angularjs _angularjs

JavaScript can not directly use = = or = = To determine whether two arrays are equal, whether it is equal or congruent, the following two lines of JS code will return false

<script type= "Text/javascript" >
alert ([]==[]);
alert ([]===[]);
</script>

To determine whether two arrays in JS are the same, you need to convert the array to a string before comparing it. The following two lines of code return True

<script type= "Text/javascript" >
alert ([].tostring () = = [].tostring ());
Alert ([].tostring () ===[].tostring ());
</script>

JS to compare whether two arrays have the same element, that is, two arrays all elements are the same, but the order of elements is not necessarily consistent. You only need to sort the array first, and then compare the two arrays for equality.

<script type= "Text/javascript" >
alert ([1,2,3].tostring () = = [3,2,1].tostring ());
Alert ([1,2,3].sort (). ToString () = [3,2,1].sort (). ToString ());
</script>

In addition, [null] makes a judgment, and you can also return [null].tostring () = = "" to True.

The above is a small set of angularjs to introduce the comparison of two arrays are the same, I hope to help you, if you have any questions please give me a message, small series will promptly reply to everyone. Here also thank you very much for the cloud Habitat Community website support!