JavaScript Switch usage considerations Analysis _javascript Tips

This article analyzes the switch usage considerations for JavaScript. Share to everyone for your reference. The specific analysis is as follows:

Let's look at the following code:

<script>
var t_jb51_net =;
Switch (t_jb51_net) {case
' a ':
alert ("string 65. Jb51.net ");
break;
</script>

You will find no pop-up dialog box, alert not executed.

Reason Analysis:

What needs to be clear here is that the switch uses the full equal sign "= = =" At the time of the comparison, and that the equals sign first looks at the same data type, and here t_jb51_net is the number type, and ' 65 ' is a string.

The following code will eject the dialog box:

<script>
var t_jb51_net =;
Switch (t_jb51_net) {case
:
alert ("number 65. Jb51.net ");
break;
</script>

I hope this article will help you with your JavaScript programming.