Comparative analysis of arrays under AngularJS

Javascript cannot directly use == or === to determine whether two arrays are equal, whether they are 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 arrays into strings first and then compare them. The following two lines of code will return true

<script type="text/javascript">
    alert([].toString()== [].toString());
    alert([].toString()===[].toString());
</script>

JS needs to compare two arrays to see if they have the same elements, that is, all elements of the two arrays are the same, but the order of the elements is not necessarily consistent. All you need to do is sort the arrays first, and then compare the two arrays to see if they are equal.

<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] can be used to judge, and [null].toString() === '' will also return true.

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