Js code : avoid modules collision

最新推荐文章于 2025-07-09 21:37:00 发布

iteye_17584

最新推荐文章于 2025-07-09 21:37:00 发布

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分类专栏： JAVASCRIPT

本文链接：https://blog.youkuaiyun.com/iteye_17584/article/details/82302466

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本文详细阐述了如何创建和检查模块化代码的过程，包括如何确保模块的正确性，以及如何在不同层级进行代码的组织与维护。

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// Create the global symbol "com" if it doesn't exist
// Throw an error if it does exist but is not an object
var com;
if (!com) com = {};
else if (typeof com != "object")
    throw new Error("com already exists and is not an object");

// Repeat the creation and type-checking code for the next level
if (!com.davidflanagan) com.davidflanagan = {}
else if (typeof com.davidflanagan != "object")
    throw new Error("com.davidflanagan already exists and is not an object");

// Throw an error if com.davidflanagan.Class already exists
if (com.davidflanagan.Class)
    throw new Error("com.davidflanagan.Class already exists");

// Otherwise, create and populate the namespace with one big object literal
com.davidflanagan.Class = {
    define: function(data) { /* code here */ },
    provides: function(o, c) { /* code here */ }
};

Testing the Availability of a Module

var com;  // Declare global symbol before testing for its presence
if (!com || !com.davidflanagan || !com.davidflanagan.Class)
    throw new Error("com/davidflanagan/Class.js has not been loaded");

The best way to structure a module of this sort is to put the code inside an anonymous function that is invoked immediately after being defined:

(function( ) {  // Define an anonymous function.  No name means no global symbol
    // Code goes here
    // Any variables are safely nested within the function,
    // so no global symbols are created.
})( );          // End the function definition and invoke it.