Comparative analysis of Angularjs under the _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 Angularjs of the comparative analysis of the log group is a small series to share all the content, hope to give you a reference, but also hope that we support the cloud-dwelling community.