Javascript script debugging method summary _ javascript skills

I believe you have tried writing javascript scripts with one error or another, but js does not have a good debugging method. Here we will introduce two methods. 1. alert Method
This is also a very primitive method, but debugging is very troublesome.
2. debugger Method
First, enable the Internet option-advanced, and remove the "Disable script debugging (Internet Explorer)" check box.
If you want other browsers to enable debugging, you can also remove the "Disable script debugging (other)" check.
Then add the debugger as needed for debugging, as shown in figure