Basic explanation of JavaScript functions

Definition of function 1. Function declaration function function name () { } 2. Function expression var aa=function(){ } function call 1. Function name () Function classification: Method 1: Named functions Anonymous function (Anonymous function cannot be called directly. If you want to call it, you need to use self-calling of the anonymous function)                     ( function(){                                     alert();                                 })(); Method 2: ​​​​​​​Built-in functions: Officially provided ​ ​ ​ ​ ​ Custom function Function parameters (formal parameters actual parameters) Parameters are in one-to-one correspondence Actual parameters > Formal parameters -- redundant actual parameters are omitted Actual parameters

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