使用MessageChannel实现深拷贝

MessageChannel可以创建一个消息通道

//传递一个字符串
const { port1, port2 } = new MessageChannel();
port1.postMessage('hello')
port2.onmessage = (e) => {
	console.log(e.data)  // hello
}

//传递一个函数，实现深拷贝
const { port1, port2 } = new MessageChannel();
const obj = {
   a: 1,
   b: {
         c: 2
   }
}
port1.postMessage(obj)
port2.onmessage = (e) => {
    console.log(e.data)  // {a: 1, b: {c: 2}}
    console.log(e.data === obj)  // false   深拷贝
}

// 封装成一个函数
function deepClone(obj) {
    return new Promise(resolve => {
        const { port1, port2 } = new MessageChannel();
        port1.postMessage(obj);
        port2.onmessage = ev => resolve(ev.data);
    });
}