Precautions for using switch in javascript _ javascript skills

This article mainly introduces the precautions for using the switch in javascript. The example analyzes the principle and usage skills of the switch statement, which is of great practical value, if you need it, you can refer to the examples in this article to analyze the precautions for using the switch in javascript. Share it with you for your reference. The specific analysis is as follows:

Let's take a look at the following code:

Script var t_jb51_net = 65; switch (t_jb51_net) {case '65': alert ("string 65. Jb51.net "); break;} script

You will find that the dialog box is not displayed and alert is not executed.

Cause analysis:

It should be clear that the switch uses the full equal sign "=" in its Judgment. When comparing the full equal sign, it first checks whether the data type is the same. Here, t_jb51_net is of the Number type, while '65' is of the String type.

The following code is displayed in the dialog box:

Script var t_jb51_net = 65; switch (t_jb51_net) {case 65: alert ("Number 65. Jb51.net "); break;} script

I hope this article will help you design javascript programs.