Js debugging tool console. log () method to view js Code Execution _ javascript skills

In the past, alert was used to view the execution of js Code. Today, I saw a friend using the console. log function prints the output function, variable, and object. The following figure shows the console. log usage records the execution status of js Code when I debug the code. Generally, I use alert in the code block to view the execution status of js Code, today, we also saw a friend using the console. log function prints the output function, variable, and object. The following figure shows the console. log usage is recorded. The specific syntax is:

Console. log ("value:", fn );

Console. log () can output variables, functions, arrays, objects, etc.

  This keyword _ function call