When I was implementing the online customer support chat system's popup effect JavaScript SDK, the SDK code that was publicly exposed was in the form of a self-executing function.
- Using self-executing functions to implement the JavaScript SDK has the following benefits:
- Code encapsulation: Self-executing functions can encapsulate your JavaScript code, avoiding the need to define variables in the global scope and preventing variable name conflicts.
- Providing APIs: Self-executing functions can provide APIs for easy use by the caller. For example, you can define some methods in the self-executing function and expose them to the caller for use.
- Controlling variable scope: Self-executing functions can control the scope of variables, avoiding the need to define variables in the global scope. This allows you to define local variables inside the function, avoiding any impact on global variables.
An immediately-invoked function expression (IIFE) is a function that is defined and executed immediately. The syntax for an IIFE is as follows:
代码语言：javascript复制(function() {
// function body
})();or:
代码语言：javascript复制(function() {
// function body
}());IIFEs can be used to encapsulate your JavaScript code, preventing the definition of variables in the global scope and thus avoiding variable name conflicts.
For example, you can use an IIFE to define local variables within the function and avoid defining variables in the global scope.
For example:
代码语言：javascript复制(function() {
// define local variables here
const myLocalVariable = 'hello';
// use the local variable
console.log(myLocalVariable);
})();This allows you to define local variables within the IIFE and avoid defining variables in the global scope.
IIFEs can also accept parameters, such as:
代码语言：javascript复制(function(param1, param2) {
// use function parameters here
console.log(param1, param2);
})('hello', 'world');This allows you to pass parameters to an IIFE.
If the passed parameter is the window object If the window object is passed to an IIFE and a property is assigned to the window object, the property becomes a global variable.
For example, you can define a global variable using the following code:
代码语言：javascript复制(function(global) {
global.myGlobalVariable = 'hello';
})(window);Open Source Customer Support Chat Software
https://gofly.v1kf.com
