antgod#blog#3.编写函数式3-作用域与闭包1

#### 动态作用域 在任何JS核心引擎中，都有一张全局表来存储全局变量 ``` const _ = require('../util/understore') // 动态作用域，任何JS核心引擎中，有个全局查找表 const globals = {} const makeBind = resolver => (name, val) => { const stack = globals[name] || [] globals[name] = resolver(stack, val) return globals } const stackBinder = makeBind((stack, val) => { stack.push(val) return stack }) const stackUnBinder = makeBind((stack) => { stack.pop() return stack }) const dynmicLookup = (name) => { const slot = globals[name] || [] return _.last(slot) } stackBinder('a', 1) stackBinder('a', 2) stackBinder('b', 100) console.log(dynmicLookup('a')) stackUnBinder('a') console.log(dynmicLookup('a')) const f