[TOC] ## 方式一 打印节点 ``` (function(win){ 'use strict'; var document = win.document; //非必须 function ready(selector, fn){ check(selector,fn); } function check(selector,fn){ var dom =document.querySelector(selector) fn(dom); } // 对外暴露ready win.getDom = ready; })(this); // usage getDom('h1', function(element){ console.log(element); }); ``` ## 方式二 ``` /** * * @type {{minus(*): void, regiset(*): void, setValue(*): void, currentValue: number, plus(*): void}} * */ const Calc = { currentValue: 0, setValue(newValue) { this.currentValue = newValue; console.log(this.currentValue); }, core: { 'plus': (currentValue, addend) => currentValue + addend, 'minus': (currentValue, addend) => currentValue - addend, }, plugins: {}, press(method, newVal) { const func = this.core[method] || this.plugins[method]; this.setValue(func(this.currentValue, newVal)); }, register(plugin) { const {name, exec} = plugin this.plugins[name] = exec } } const squaredPlugin = { name: "squared", exec: function (currentValue) { return currentValue*currentValue } } Calc.register(squaredPlugin) // 使用计算器 Calc.setValue(3); // => 3 Calc.press('plus', 2); // => 5 Calc.press('squared'); // => 25 Calc.press('squared'); // => 625 ```