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  • 函数的链式调用实现Man().sleep().eat()

    let index = 0;
    let stack = [];
    function next() {
    let fn = stack[index];
    index++;
    if(typeof fn === 'function'){
    fn();
    }
    }
    function fn1() {
    console.log(1)
    next()
    }
    function fn2() {
    setTimeout(function() {
    console.log(2)
    next()
    },0)
     
    }
    function fn3() {
    console.log(3)
    next()
    }

    // stack.push(fn1)
    // stack.push(fn2)
    // stack.push(fn3)
    function Man(name) {
    stack.push(function(){
    console.log(name);
    next();
    })
    }
    var LazyMan = function(name) {
    return new Man(name)
    }
    Man.prototype.sleep = function(time){
     
    stack.push(function(){
    setTimeout(function() {
    console.log(time + '秒')
    next()
    },time *1000)
    })
    return this;
    }
    Man.prototype.eat = function(food){
     
    stack.push(function(){
    console.log('eat '+food)
    next();
    })
    return this;
    }
    Man.prototype.sleepFirst = function(time){
    stack.unshift(function(){
    setTimeout(function() {
    console.log('wake up after '+ time + '秒')
    next()
    },time *1000)
    })
    return this;
    }

    // LazyMan('Hank')

    /* 输出:

    Hi! This is Hank!

    */

    // LazyMan('Hank').sleep(1).eat('dinner')

    /* 输出:

    Hi! This is Hank!

    // 等待10秒..

    Wake up after 10

    Eat dinner~

    */

    // LazyMan('Hank').eat('dinner').eat('“supper”')

    /* 输出:

    Hi This is Hank!

    Eat dinner~

    Eat supper~

    */

    LazyMan('“Hank”').sleepFirst(2).eat('“supper”')

    /* 等待5秒,输出

    Wake up after 5

    Hi This is Hank!

    Eat supper

    */
    // console.log(stack[0]())
    next()
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  • 原文地址:https://www.cnblogs.com/hellobeen/p/been101.html
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