JavaScript Tutorial: Several ways to write anonymous functions

Anonymous functions can effectively control the scope of variables and construct closures (Closure) to prevent pollution of global variables. In JavaScript, there are several ways to write anonymous functions:

Error mode: syntax error warning

function () {
//Insert code here
} ();

Mode one: function literal (functions Literal)

Declare the function object first, and then execute.

(function () {
//Insert code here
}) ();

Mode two: Precedence expression (Prior Expression)

Because JavaScript executes an expression from inside to outside, parentheses are used to enforce a declared function.

(function () {
//Insert code here
} ());

Mode III: void operator (void Operator)

Use the Void operator to perform a separate operand.

void function () {
//Insert code here
} ();

Technically speaking, these three code patterns are equivalent. But in practical applications, such as YUI, JQuery and other frameworks, pattern one is more widely used.