1 该插件封装了原生的定时器的方法

插件npm链接

2 项目中使用该插件的原因

主要是在react项目中，在自定义的组件上使用了mobox，设置了observer之后，该组件调用的setTimeout等方法，并非windows对象原生的方法，而是native function，所以import了该插件中的相关方法，从而实现原生的定时器功能
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3 相关源码

var scope = (typeof global !== "undefined" && global) ||(typeof self !== "undefined" && self) ||window;
var apply = Function.prototype.apply;// DOM APIs, for completenessexports.setTimeout = function() {return new Timeout(apply.call(setTimeout, scope, arguments), clearTimeout);
};
exports.setInterval = function() {return new Timeout(apply.call(setInterval, scope, arguments), clearInterval);
};
exports.clearTimeout =
exports.clearInterval = function(timeout) {if (timeout) {timeout.close();}
};function Timeout(id, clearFn) {this._id = id;this._clearFn = clearFn;
}
Timeout.prototype.unref = Timeout.prototype.ref = function() {};
Timeout.prototype.close = function() {this._clearFn.call(scope, this._id);
};// Does not start the time, just sets up the members needed.
exports.enroll = function(item, msecs) {clearTimeout(item._idleTimeoutId);item._idleTimeout = msecs;
};exports.unenroll = function(item) {clearTimeout(item._idleTimeoutId);item._idleTimeout = -1;
};exports._unrefActive = exports.active = function(item) {clearTimeout(item._idleTimeoutId);var msecs = item._idleTimeout;if (msecs >= 0) {item._idleTimeoutId = setTimeout(function onTimeout() {if (item._onTimeout)item._onTimeout();}, msecs);}
};// setimmediate attaches itself to the global object
require("setimmediate");
// On some exotic environments, it's not clear which object `setimmediate` was
// able to install onto.  Search each possibility in the same order as the
// `setimmediate` library.
exports.setImmediate = (typeof self !== "undefined" && self.setImmediate) ||(typeof global !== "undefined" && global.setImmediate) ||(this && this.setImmediate);
exports.clearImmediate = (typeof self !== "undefined" && self.clearImmediate) ||(typeof global !== "undefined" && global.clearImmediate) ||(this && this.clearImmediate);复制代码