There is a problem. If node-zone include node-zone, the outside will be replaced by the last child zone data.

从 issue 中的复现开始，检查 current、fork 和 run 的 node-zone 实现。复现嵌套的异步调用，然后追踪为什么外层 zone 会被最后一个子 zone 替换；完成的标准是子 zone 结束后，外层 current 仍然保留其原始数据。

const {current} = require('node-zone');

let zone = current.fork('my zone');
zone.data = {test: 'test'};
zone.run(async () => {
    let __current = require('node-zone').current;
    console.log(__current);
    for (let i = 0; i < 50; i++) {
        (async function (i) {
            let zone = current.fork('my zone ' + i);
            zone.data = {i: i};
            // zone.run()
            // zone.set('i', 123456);
            // console.log(current);
            zone.run(async () => {
                (async function () {
                    (async function () {
                        (async function () {
                            let {current} = require('node-zone');
                            // console.log(common.timeHelper.format_ms(), current);
                            console.log(current);
                        })();
                    })();
                })();
            });
        })(i);
    }
    //will lost the current, will show the last child zone data.
    console.log('current zone data', __current);
    console.log('last child zone data', require('node-zone'));
});
return;