JavaScript Note 05: The difference between a function expression and a function statement

1. The first is the function statement:

MyFunc (); function  MyFunc () {   //execute some statements}

When a function statement is defined, it is preferred in a script code, so that the function can be used by the script, either before or after the definition, as in the above statement.

2. Function Expressions:

MyFunc (); var myfunc = function () {//EXECUTE statement}

The above statement does not run successfully, only the following statement can successfully run the amount:

var myfunc = function () {//executed statement}myfunc ();

If it looks like the following:

var myfunc = function () {//EXECUTE statement}myfunc ();//can be called MyFunc = Null;myfunc ();//Can not be called, (or delete array element or attribute value),  Then the function expression conforms to the condition that the garbage collection mechanism is used

JavaScript Note 05: The difference between a function expression and a function statement