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py8765 avatar py8765 commented on June 18, 2024

首先,io对象是socket.io.js这个文件中exports出去的,(function (exports, global) {
//omitted
})('object' === typeof module ? module.exports : (this.io = {}), this);

其次,下面的代码分别是针对这个文件在node中运行还是在浏览器中运行做了一个判断,
if (typeof module !== 'undefined' && module.exports) {
module.exports.EventEmitter = EventEmitter; //do something that applies to node
}
else {
root = window; //do something that applies to browser
root.EventEmitter = EventEmitter;
}
我们是将pomelo对象挂到window对象下,所以在client.js下可以用window.pomelo获得。

from pomelo.

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